freebsd-update can be used without a reference to CBSD. Note that the utility works with the official FreeBSD resource and configure it to the repository CBSD is impossible, those only one source.

Update files for base jail through freebsd-update can via specified key -b path to directory which used by CBSD when mounting jail baserw=0. For example, if your cbsd $workdir - /usr/jails, then for amd64 and version 10.0 is the path to base: /usr/jails/basejail/base_amd64_amd64_10.0. This directory should be updated:

% freebsd-update -b /usr/jails/basejail/base_amd64_amd64_10.0 fetch
% freebsd-update -b /usr/jails/basejail/base_amd64_amd64_10.0 install
		

If you do not have baserw=1 jail, then its the end. If baserw=1 jails exists, to update them there are two possibilities:

• As in the case above, for each jail cause freebsd-update and specify the path to data directory of the jail ( $workdir/jails-data/$jname )
• Or, after basejail upgrade as described above, execute:

  cbsd jupgrade jname=XXXX
  			

  for each baserw=1 jail - this command reshapes base ( $workdir/jails-data/$jname ) of the jail from the $workdir/basejail/* files

Option with the upgrade jail in mode baserw=0 to a new version base is the easiest is to change the version in the configurator

			% cbsd jconfig jname=XXX
		

Since in this case only changes the source directory that link on start jail. Example of updating jail from 9.2 to 10.0 version.

Baseline: there x86-64 system with a base of FreeBSD 9.2 and jail jail1 on this base, upgrade to 10.0.

When jail is stopped, we go in the configurator via

			% cbsd jconfig jname=jail1
		

and change ver parameter to 10.0, then save it via "Commit". Or, as in the screenshot — do change through cbsd jset

On the next run, the jails will mount base 10.0 (on screenshot the base in the system not found and CBSD has invited her to download). Of course, with such a upgrade to a new major version, after this operation you need to rebuild the software in the jail or update it through pkg — operation is highly desirable because library system changed. As a minimum, to identify this fact we can use the libchk utils.

Upgrade of baserw=1 takes a different scenario, since on this operation CBSD will overwrite the old base system files to the new in jail data directory $workdir/jails-data/$jname.

Baseline: we need uprgade jail jail1 baserw=1 mode (in-law, its root path PATH points in jls pointed to jails-data, rather than jail directory) from 9.2 to 10.0 version.

Verify through the file utility, which reads ELF table that file /bin/sh of jails belongs version 9x. And in the same way, check the version of the file after the upgrade:

			% file -s /usr/jails/jails-data/jail1-data/bin/sh
			/usr/jails/jails-data/jail1-data/bin/sh: ELF 64-bit LSB executable, x86-64, version 1 (FreeBSD), dynamically linked (uses shared libs), for FreeBSD 9.2, stripped
		

When stopped jails perform change version through cbsd jconfig or cbsd jset, then perform the upgrade procedure:

			% cbsd jupgrade jname=jail1
		

This operation causes the system to overwrite all the files in the base jail from your base original directory $workdir/basejails/base_\*_\*_ver

There are cases when you need to upgrade the files in one version, for example, base 10.0 to 10.0-p1. For jails who have mounted base through nullfs (baserw=0), simply re-download the $workdir/basejail/base_\*_\*_ver directory to more recent version. For this you can use the command:

			% cbsd repo action=get sources=base mode=upgrade
		

- flags mode=upgrade permits to CBSD overwrite this directory with new files, if you already have a version of the base for this version. Or, you can build a more recent version of the base, using Building and upgrading bases Also, you can go with the base version with a RELEASE to STABLE (in this case, the name of the base directory will not X.Y, just X. Ie, instead base_\*_\*_9.2 will be used base_\*_\*_9 directory. For this you need in configurator of jail (cbsd jconfig) change the parameter stable=0 to stable=1 (either through cbsd initenv-tui mode is set STABLE branches globally), and do not forget to add stable=1 flags in repo command (if not set globally)

			% cbsd repo action=get sources=base mode=upgrade stable=1
		

Similar rules for jails with baserw=1, it is only necessary to remember after update in CBSD to start the update process files by cbsd jupgrade

In addition, provided that you have a base system in the corresponding version (or you jail migrated to another server where there is a base more recent), when you start the jail with baserw=1, CBSD can automatically check for more recent files for this version and show information message "You have a more recent version of the base in ...":

Updating binary files is half the trouble) You must also synchronize the configuration files. See how CBSD may be useful here: etcupdate helper

			% cbsd natcfg
			% cbsd naton
			% cbsd natoff
		

Description:

Jails do not always require external IP, or, for security reasons, a number of services need to deploy on private IPs, so they were not available from the Internet. Thus, the jails may be needed for Internet access.

In this case the NAT translating the private IP address of the jails to external IP of the server. CBSD functional has a configuration template NAT rules for translating of private networks RFC1918. To do this, this command as the first step is required:

			% cbsd natcfg
		

for selecting the appropriate framework for which the configuration will be loaded NAT: pf, ipfw and ipfilter. The names of the relevant frameworks

Selection framework and IP for NAT alias executed when you first start cbsd initenv, can later be reconfigured through cbsd initenv-tui To natip changed in force, you must run cbsd natcfg and cbsd naton again. Currently, the cbsd configuration NAT limited to the creation of rules for translating private networks. If you need to get something more from simple NAT rule, you can edit the rules file created manually in the directory $workdir/etc/ in files:

• pfnat.conf, when PF is used
• ipfw.conf, when IPFW is used, or
• ipfilter.conf, wnen using IPNAT from IPFilter

Note:

If nodeip (IP of nodes), he is within RFC1918 networks for the subnet broadcast NAT rule will not be created. To disable nat control by CBSD, use the follow command:

			% cbsd natoff
		

ipfw_load="YES"
net.inet.ip.fw.default_to_accept=1
		

Example. Start the configurator and activate the NAT through pf, with aliasing-IP as 192.168.1.2, previously initialized in /etc/rc.conf:

% cbsd natcfg
Configure NAT for RFC1918 Network?
[yes(1) or no(0)]
yes
Set IP address as the aliasing NAT address, e.g: 192.168.1.2

Which NAT framework do you want to use: [pf]
(type FW name, eg pf,ipfw,ipfilter or "exit" for break)

% cbsd naton
No ALTQ support in kernel
ALTQ related functions disabled
No ALTQ support in kernel
ALTQ related functions disabled
pfctl: pf already enabled
		

			% cbsd jls
		

Show the lists of environment on a local node or for all nodes. You can adjust the displayed fields through the argument display. If display is not specified, the value takes from $workdir/etc/defaults/jls.conf file, which you can change at its discretion via $workdir/etc/jls.conf. To hide the header, use the argument header=0.

All possible options for the sample described in the $workdir/share/jail-arg file

In addition to the basic CBSD values, you can add your own fields and values for output with the jls command. More on this: environment custom facts

JID	Jail ID
JNAME	environment name
IP4_ADDR	list of assigned IP addresses (IPv4,IPv6)
HOST_HOSTNAME	environment FQDN
PATH	root filesystem for jail
STATUS	On (running), Off (stoped), Unregister (missing in the SQL database)

For vnet-based environments with a virtual stack, the REAL_IP4 field for displaying the actual IP addresses inside the environment may also be useful to you.

Note: Jail in the unregister status may be insert to SQL database via command: cbsd jregister. If remote nodes are added to the local server, you can display all env in the farm through:

			cbsd jls alljails=1
		

or

			cbsd jls alljails=1 shownode=1
		

for output with node name where jail are hosted. In the output from cbsd jls alljails, it is possible to see only active jails (in status On)

Another example:

			% cbsd jls display=jname,ip4_addr,vnet,real_ip4,astart
			% cbsd jls header=0 display=jname,mycustom1,mycustom2,status
		

			% cbsd jlogin
		

Description:

Performs a login to the jail as root user. If the jail isn't present on the local node, but rather on one of the remote nodes, jlogin will attempt to login over ssh.

If no jail is specified, a list of all known online jails in the farm is displayed (provided remote hosts were added).

If you remotely connect to a jail and node which have tmux installed, tmux will be launched at login and the session is given the name taken from the server's nodename (taken from jlogin).

Additional sessions will automatically join the tmux session through a tmux-attach. When the last connection is closed the tmux session ends (you may detach via Ctrl + b , d to keep it running).

Should you prefer NOT to use tmux on jlogin, copy ${workdir}/defaults/jlogin.conf to ${workdir}/etc/jlogin.conf and set tmux_login to 0.

In order to deactivate "try to login?" when logging in to remote nodes, set always_rlogin to 1 in your ${workdir}/etc/jlogin.conf.

Example:

			% cbsd jlogin kde4
		

Starting with the version of CBSD 11.1.2, you can customize the command, redefining the action on you more suitable

This is achieved through the configuration file blogin.conf and the parameter login_cmd.

The file can be placed for the individual environment in the directory $workdir/jails-system/$jname/etc, and globally, overwriting the value from $workdir/etc/defaults/blogin.conf. To do this, create a file with your configuration in the directory $workdir/etc/

With a custom call, you can use CBSD variables - for this or that environment

For example, if you want instead of the standard behavior, when the blogin lauched ssh client, the file $workdir/etc/blogin.conf can look like this:

		login_cmd="/usr/bin/ssh your_user@${ipv4_first}"
		

			% cbsd jget
		

			% cbsd jset
		

Description:

Example:

			% cbsd jclone
		

			% cbsd jrclone
		

Description:

Creates a clone of a given jail. The command requires the name of the original jail (passed with old) as well as a name for the clone, specified with new and a FQDN (hostname) with host_hostname. Optionally a new IP Address can be given with the ip4_addr parameter (multiple IPs need to be separated by commas).

ZFS cloning features is ultra fast operation (thanks to Copy-on-write), but imposes some restrictions - you will be dependent on the parent snapshot.

You can control this behaviour via clone_method= argument or, to set it globally, use rclone.conf and bclone.conf to overwrite settings from 'auto' to 'rsync':

		% echo 'clone_method="rsync"' > ~cbsd/etc/rclone.conf
		% echo 'clone_method="rsync"' > ~cbsd/etc/bclone.conf
		

Custom data cloning jail method

You can create your own data cloning method using script(s) in the directory $workdir/jail-system/$jname/clone-local.d.

For example, creating a script to the $workdir/jail-system/$jname/clone-local.d/ directory with the name myclone.sh and the contents of the form:

			#!/bin/sh
			echo "My custom clone for: $jname -> $newjname
			echo "${data} -> ${newdata}"
			/bin/cp -Ra ${data} ${newdata}
		

You will force CBSD to execute your script as a data cloning method.

Please note that standard variables are available in the script CBSD variables. Additionally, these variables are exported: $newjname,$newdata

Why it is needed: if you use NAS or NFS as a storage and have access there, you can clone the data using NAS or directly on the NFS server, which will significantly increase the cloning speed and reduce unnecessary traffic. See: Issue #373

Example:

cloning jail jail2 to jail3 with changes ip address ip4_addr and name of hosts host_hostname:

			% cbsd jclone old=jail2 new=jail3 host_hostname=jail3.my.domain ip4_addr=10.0.0.22/24
		

			% cbsd jsnapshot
		

A variety of operations on jails become available through jsnapshot when the node is kept on a ZFS filesystem and zfsfeat is set to 1 in $workdir/nc.inventory. The mode parameter is used to specify which of the following actions are taken:

• list — show a list of existing snapshots for the selected jail
• create — create a snapshot
• destroy — delete a specific snapshot of the jail
• destroyall — remove all of the jail's snapshots
• clone — clone an existing snapshot into new jail
• rollback — rollback the selected jail to current snapshot state

Additional arguments:

• jname — specifies the jail upon which the action will be performed
• snapname — gives the snapshot a name

It should be kept in mind that snapshots follow a tree structure. This means, if you created a series of snapshots : 1,2,3,4 and roll back to snapshot 2, then the snapshots 3 and 4 will be lost, since from the point of snapshot 2 they did not exist yet. Also use a unique name for a snapshot at creation. You can specify snapname=gettimeofday. In this case, the system automatically sets the current timestamp as the name for the new snapshot. When listing snapshots, you can use modifiers to customize output fields with arguments to display=

Example:

create snapshot named gromozeka for jail1 jail:

			% cbsd jsnapshot mode=create jname=jail1 snapname=gromozeka
		

create snapshot named zelepuka for jail1 jail:

			% cbsd jsnapshot mode=create jname=jail1 snapname=zelepuka
		

Run jail1 and stop after some modification:

			% cbsd jstart jail1
			..
			% cbsd jexec jname=jail1 cp /bin/date /root
			% cbsd jexec jname=jail1 file -s /root/date
			/root/date: ELF 64-bit LSB executable, x86-64, version 1 (FreeBSD), dynamically linked (uses shared libs), for FreeBSD 9.0 (900506), stripped
			% cbsd jstop jail1
			..
		

Rollback jail1 to snapshot zelepuka state:

			% cbsd jsnapshot mode=rollback snapname=zelepuka jname=jail1
			% cbsd jstart jail1
			...
			% cbsd jexec jname=jail1 file -s /root/date
			/root/date: ERROR: cannot open `/root/date' (No such file or directory)
		

			% cbsd jexport
		

Description:

Export jail into file (*.img). In jname arguments you can set jail for export. img-file stored in $workdir/export directory. Original jail after exports is not modified

You can control compress level via compress arguments

CBSD use xz(1), tools for compress images and you can learn in man page about compress diffrence between compress level.

By default CBSD use compress=6. You can disable compression with compress=0

Example (export mysqljail jail to $workdir/export/mysqljail.img):

			% cbsd jexport jname=mysqljail
		

There are situations where you do not want to include one or another information from the container in the exported image. For example, if you are exporting a working container having a mounted port of ports in /usr/ports.

In this case, you can help the jexport_exclude parameter, which can be specified globally in the jexport.conf configuration file (just copy default jexport.conf from /usr/local/cbsd/etc/defaults/ to ~cbsd/etc/ and adjust the value for jexport_exclude

If you want to specify alternative exclude for a specific Jail, copy this file to the ~cbsd/jails-system/$jname/etc / directory. In this case, when you make an jexport call, these exceptions will be applied for $jname container only.

Finally, you can do exclude without a configuration file at all, just listing all exceptions (space separated) as the jexport_exclude= parameter when calling the jexport script, for example:

			cbsd jexport jname=jail1 jexport_exclude="/var/run/* /usr/ports"
		

In this example, ports tree directory will not copy to image: since this data can always be mounted from the host. And also, eliminates the presence of dead .pid files that can affect the correctness of the launch of the container's services after importing.

Exceptions are indicated relative to the root directory of the container. So, if you want to migrate to another host jail1 container configuration using jexport/jimport and do not want to copy any of its data, simply specify / as an exception:

			cbsd jexport jname=jail1 jexport_exclude="/"
		

			% cbsd jimport
		

Import jail from (*.img) file.

In jname argument you can set full path to file or just filename (without .img extension) if file placed in $workdir/import directory. img-file after import is not modified. In addition, you can import an image of a jail in an alternate name (for example, you want to deploy the image of the jail1 from jail1.img, however, your system already has a jail of the same name). In this case, an argument newjname can be used.

Example:

import jail from /tmp/mysqljail.img file:

			% cbsd jimport jname=/tmp/mysqljail.img
		

Example:

import the image jail2.img placed in $workdir/import with a new name jail5:

			% cbsd jimport jname=jail2 newjname=jail5 
		

			% cbsd jbackup
		

Description:

Example:

			% cbsd jdescr
		

Each jail can have an optional description/summary. With this it is possible to generate dynamic documentation on admin pages. Using cbsd jdescr by itself outputs a description of all local jails.

Command

			% cbsd jdescr mode=update jname=jname
		

runs nvi in edit mode and opens the description of the jail specified by jname. If you prefer using a different editor such (such as vim or mcedit it can easily be done by passing your choice with the editor variable. Descriptions for each jail are stored in a text file residing at $workdir/jails-system/$jname/descr, where jname is the name of the jail. When a jail is moved or copied with jcoldmigrate, jclone, jimport/export operations, the description will remain the same.

Example (running mcedit to modify the kde4 jail using russian UTF8 charset):

			% setenv LANG ru_RU.UTF-8
			% cbsd jdescr jname=kde4 editor=mcedit mode=update
		

It is advisable to maintain meaningful descriptions as your collection of jails grows. In addition it can be quite convenient to aggregate this information in order to create dashboards and build jail maps. One example of how this could look is the following simple script: jmap2html.sh.html which generates an overview in the form of a HTML page dashboard sample

			% cbsd jcoldmigrate
		

cbsd jcoldmigrate does cold (with stoping) migration jail from one node to another. Argmument node point for destination node. Preliminary, RSA/DSA key for remote node must be added via cbsd node mode=add operation. Also, on a remote node service rsyncd should work (cbsdrsync).

By default, the jail status on a new node is inherited — if the jail worked, it also will be automatically started on a new node. If the jail didn't work — remains in Off status. To operate, what status should be on a remote jail not is dependent on a condition on the original, it is possible through parameter start.

Jail on the source, after successful jcoldmigrate will be stoped and switch to Slave status (unregister). In rc.conf file of jail on the destination node there will be a record where this jail came from.

Notes: For jcoldmigrate, the next action is performed (in process they pass automatically and aren't visible)

• copy configuration files to remote node, status of jail set to Slave on remote node (cbsd j2prepare)
• exec rsync, which does a full copy of the directory with data to remote node (cbsd j2slave)
• stop jails (if running) on the source node (cbsd j2slave)
• one more rsync job, for synchronization of those files which be modified
• switch jail status on source to Slave (cbsd jswmode)
• switch jail status to master on the remote node (cbsd rexe + jswmode)
• If jail was running — start jail on remode node (cbsd rexe + cbsd jstart)

Example

make cold migration for jail amp123 to netsnap node):

			% cbsd jcoldmigrate node=netsnap jname=amp123
	

on the destionation node anything isn't present now:

from node cbuilder64 migrate jail amp123 to netsnap:

jail amp123 on netsnap was started automatically:

			% cbsd jrctl
			% cbsd jrctl-tui
		

CBSD supports many of FreeBSD's mechanisms for enforcing limits on a jail's resource usage, such as: zfs quota, rctl(8) и cpuset

The most popular limitation parameters in the installation are the limits on the consumption of CPU and RAM.

You can limit the CPU consumption via RACCT (cputime= and pcpu= parameters), or use a fixed number of cores allocation (via cpuset) via the cpu= parameter.

In our research and testing, cpu= is the most practical and demanded solution.

The cpu= parameter specifies how many cores the container can recycle. You can immediately create a container limited, for example, to one core:

		% cbsd jcreate jname=myjail cpu=1 runasap=1
		

Besides limiting kernels, you may want to limit memory consumption via vmemoryuse=:

		% cbsd jcreate jname=myjail cpu=1 vmemoryuse=1g runasap=1
		

Or, if you prefer to create environments through the CBSDfile, it might look like this:

jail_test2()
{
        ip4_addr="DHCP"
        host_hostname="test2.my.domain"
        pkg_bootstrap="0"

        # LIMIT/QUOTAs:
        fsquota="10g"           # set ZFS dataset quota
        cpu="1"                 # only one vCPU allowed!
        vmemoryuse="512m"       # only 512MB RAM allowed!
}
		

Floating file quotas are only possible for jails residing on ZFS-file system. The quota is regulated through the fsquota= parameter. For systems stored on UFS a similar restrictions can be enforced using an md(4)-based vnode file/image and making use of mdsize for the jail).

CBSD uses renice(8) to prioritize each jail's access to the CPU. This makes it possible to select different priorities on a per jail basis and give the most impoartant jails the highest share of CPU time. For example, you may want to have your distcc jail set to a low priority, give your web server medium and the jail hosting the databse the highest priority. The actual priorization is taken care of by nice which gets the value for each jail from jail rctl. The values set here correspond to the behavior of nice(1) — the lowest integer resulting in the highest priority.

Renice example:

1) Let's create an AMP jail and have it run a php script that performs some work (such as bench.zip taken from http://www.php-benchmark-script.com/). We then clone the jail, calling the first highprio1 and the second lowprio1. Using cbsd jrctl-tui we give the first the highest possible priority -20, and set the second jail to the lowest priority of 20. In addition we limit the jail to one core through cpuset with cbsd jconfig (single-core systems are hard to come by these days and smart schedulers do not allow for a clean experiment without taking this step ;-).

			% cbsd jls display=jid,jname,ip4_addr,cpuset
			16   highprio1   10.0.0.121/24  4
			17   lowprio1    10.0.0.122/24  4
		

— jid 16 is the higher prioritised jail while jid 17 — is set to a lower priority. Both run on the fourth core.

make poll top state congestion php-fpm with JID output:

		% export iter=1
		% while [ 1 ]; do
			printf "Iter: $iter" ;
			iter=$((iter+1))
			top -jab | grep php
			sleep 1
		done
		

We launch the script on both IPs at the same time:

	% fetch -T 300 -o /dev/stdout http://10.0.0.121 & fetch -T 300 -o /dev/stdout http://10.0.0.122 & 
	[1] 65985
	[2] 65986
	
	--------------------------------------
	|        PHP BENCHMARK SCRIPT        |
	--------------------------------------
	Start : 2014-01-06 16:28:59
	Server : @10.0.0.121
	PHP version : 5.4.23
	Platform : FreeBSD
	--------------------------------------
	test_math                 : 12.870 sec.
	test_stringmanipulation   : 15.896 sec.
	test_loops                : 8.968 sec.
	test_ifelse               : 7.864 sec.
	--------------------------------------
	Total time:               : 45.598 sec.
	
	--------------------------------------
	|        PHP BENCHMARK SCRIPT        |
	--------------------------------------
	Start : 2014-01-06 16:29:02
	Server : @10.0.0.122
	PHP version : 5.4.23
	Platform : FreeBSD
	--------------------------------------
	test_math                 : 32.632 sec.
	test_stringmanipulation   : 18.053 sec.
	test_loops                : 6.323 sec.
	test_ifelse               : 5.504 sec.
	--------------------------------------
	Total time:               : 62.512 sec.
	
	[2]    Done                          fetch -T 300 -o /dev/stdout http://10.0.0.122
	[1]  + Done                          fetch -T 300 -o /dev/stdout http://10.0.0.121
		

and we can soon observe the following output from top:

	Iter: 1
	65101  16 www           1  35  -20 32548K 11456K CPU4    4   0:35  20.56% php-fpm: pool www (php-fpm)
	65587  17 www           1  52   20 32548K 11456K RUN     4   0:32   0.00% php-fpm: pool www (php-fpm)
	Iter: 2
	65101  16 www           1  60  -20 32548K 11456K RUN     4   0:36  25.98% php-fpm: pool www (php-fpm)
	65587  17 www           1  42   20 32548K 11456K CPU4    4   0:33   2.10% php-fpm: pool www (php-fpm)
	Iter: 3
	65101  16 www           1  60  -20 32548K 11456K CPU4    4   0:36  26.27% php-fpm: pool www (php-fpm)
	65587  17 www           1  94   20 32548K 11456K RUN     4   0:33   8.59% php-fpm: pool www (php-fpm)
	Iter: 4
	65101  16 www           1  61  -20 32548K 11456K CPU4    4   0:37  31.69% php-fpm: pool www (php-fpm)
	65587  17 www           1  95   20 32548K 11456K RUN     4   0:34   9.47% php-fpm: pool www (php-fpm)
	Iter: 5
	65101  16 www           1  62  -20 32548K 11456K CPU4    4   0:37  35.60% php-fpm: pool www (php-fpm)
	65587  17 www           1  95   20 32548K 11456K RUN     4   0:34  11.18% php-fpm: pool www (php-fpm)
	Iter: 6
	65101  16 www           1  64  -20 32548K 11456K CPU4    4   0:38  38.96% php-fpm: pool www (php-fpm)
	65587  17 www           1  96   20 32548K 11456K RUN     4   0:34  12.79% php-fpm: pool www (php-fpm)
	..
		

The jail with jid 16 is getting a larger share of the available CPU cycles and executes almost 1.5 times faster.

If your kernel has support RACCT/RCTL, you can set limits on the jail and watch the current statistics for jail resources. To do this, there is a command cbsd jrctl, which arguments

			% cbsd jrctl mode=apply  ...
		

and

			% cbsd jrctl mode=unset  ...
		

automatically called for the install or removal of limits when working jstart or jstop respectively. By command:

			% cbsd jrctl mode=show
		

you can see current statistics on the jail resources consumed, which can be used to generate reports and graphs for loading jail, as well as the CBSD daemon used to generate recommendations on the need to add new resources and for overload warnings.

By command:

			% cbsd jrctl
		

without arguments you cat see default limits on all jails. Through argument display you can specify the fields for output data. If display is not specified, the value takes from $workdir/etc/defaults/jrctl.conf file, which you can change at its discretion via $workdir/etc/jrctl.conf

You can edit the limits through

			% cbsd jrctl-tui jname=jname
		

or, if you build a hosting and want to create limits on non-interactively, you can generate a file $workdir/$jname/jail.limits

By jrctl you can set the following limits jail:

a) All you can do a framework FreeBSD rctl(8):

	cputime 	   CPU time, in seconds
	datasize	   data size, in bytes
	stacksize	   stack size, in bytes
	coredumpsize	   core dump size, in bytes
	memoryuse	   resident set size, in bytes
	memorylocked	   locked memory, in bytes
	maxproc 	   number of processes
	openfiles	   file descriptor table size
	vmemoryuse	   address space limit, in bytes
	pseudoterminals    number of PTYs
	swapuse 	   swap usage, in bytes
	nthr		   number of threads
	msgqqueued	   number of queued SysV messages
	msgqsize	   SysV message queue size, in bytes
	nmsgq		   number of SysV message queues
	nsem		   number of SysV semaphores
	nsemop		   number of SysV semaphores modified in a single semop(2) call
	nshm		   number of SysV shared memory segments
	shmsize 	   SysV shared memory size, in bytes
	wallclock	   wallclock time, in seconds
		

			% cbsd jail2iso
		

The jail2iso script allows tirmomg a specified jail into bootable images for CD/DVD/Memstick media or the bhyve hypervisor. Despite jail2iso not being used by CBSD itself for its operation or jails, the script can be very useful for easy and comfortable creation of customized LiveCDs, and testing their configuration in a jail environment. This functionality can be useful when:

• Creating rescue-system with desired tools
• Building your own FreeBSD distribution
• Creating images for diskless servers/stations (eg booted from PXE, MicroSD, Flash, CD/DVD, etc.) and have mounted home directories or jails/data files from NFS/FibreChannel/iSCSI/InfiniBand.
• Transfering environment from jail to a bhyve image to make use of bhyve features

• Creation of file hierarchy of next image consisting of mounted base and data of a jail
• Creation of MFS/UZIP of an image which will remain in memory. It is used generally for work acceleration in the LiveCD mode, allowing for "cache" often caused utilities and libraries, for example from / to /usr.
• Mount over MFS of hierarchy of data from file system of the media through nullfs/RO
• Mount through tmpfs over RO file system for modification in LiveCD mode.

If you need a number of directories reload when loading image in RW via tmpfs, before executing jail2iso you needs to be written to a file $systemdir/jail/tmpfsdir all the path. For example rescuebsd jail is a file: /usr/jails/jails-system/rescuebsd/tmpfsdir with content:

		/root
		/var/run
		/var/cache
		/var/db
		/var/spool
		/var/log
		/usr/home
		/usr/local/etc
		

These entries are processed /etc/rc.d/tmpfsdir, which will save to the image by jail2iso. All contents of these files, which is on the jail, will be moved to tmpfs filesystem. As RW areas are mounted through TMPFS, the quantity of memory available to record will depend on quantity of RAM of servers on which LiveCD is started.

You may prefer to write your own /boot/loader.conf to created image. To do this, save the file loader.conf in the directory $systemdir/$jname/. Everything you write in this file will be added to loader.conf, generated jail2iso, which has the following mandatory entries:

			kern.ipc.shmmni=4096
			kern.ipc.shmseg=4096
			radeonkms_load="YES"
			i915kms_load="YES"
			linux_load="YES"
		

You can specify what type of image jail2iso is to create, ISO image with cd9960 for CD/DVD/VMs or Memstick, an image that you can burn to a USB Flash drive.

Since the image will be initially bhyve mode RW, it does not require the creation of RO image with UZIP and support tmpfsdir, so at this stage there is no formation of an image. The script will automatically create a fstab-entry to mount an appropriate device in bhyve machine and updates /etc/ttys as required instructions. When creating an image bhyve, use the parameter:

			% cbsd jail2iso ... freesize=
		

Because without this option, create disk volume equal to the volume of evidence, without reserve. This will make the system broken, so through freesize= further specify the amount of free space in the image there after copying master data.

For more information

cbsd jail2iso is not controlled and does not limit the volume of the final result — they are limited only by your destination media:

For create ISO image use:

			%  cbsd jail2iso media=iso ..
		

For create memstick image use:

			% cbsd jail2iso media=memstick ..
		

For create bhyve image use:

			% cbsd jail2iso media=bhyve freesize=XXg ..
		

Directory where to save the image specified as an argument dstdir.

By default, the image will be have GENERIC kernel from $workdir/basejail/ directory. You can get this kernel via

% cbsd repo action=get sources=kernel

for your version of FreeBSD, or build it yourself through cbsd buildkernel. If the GENERIC kernel is not suitable as an argument name for jail2iso you can specify a different kernel if you have it.

In addition, to reduce the size of the final image, jail2iso a series of actions:

• removal .a-archive files in lib directories
• removing unnecessary data by file list

By default, this list is located in the $workdir/share/jail2iso-prunelist. You can correct them if you needed, or create your own, specifying the path to it as an argument prunelist

Example of creating memstick from jail1:

			% cbsd jail2iso media=memstic jname=jail dstdir=/tmp
		

If the file /tmp/jail1.img created, it can be writte to a USB device via the command:

			dd if=/tmp/mc.img of=/dev/da0 bs="10240" conv="sync"
		

, where /dev/da0 — is USB Flash storage.

Example of creating and launching bhyve image from jail1 with networks via interface em0:

			% cbsd jail2iso media=bhyve jname=jail1 dstdir=/tmp freesize=1g
			% kldload vmm
			% kldload if_tap
			% sysctl -w net.link.tap.up_on_open=1
			% ifconfig tap0 create
			% ifconfig bridge0 create
			% ifconfig bridge0 addm em0 addm tap0
			% ifconfig bridge0 up
			% sh /usr/share/examples/bhyve/vmrun.sh -d /tmp/jail1-10.0_amd64.img vm1 
		

where /tmp/jail1-10.0_amd64.img — result from jail2iso.

			% cbsd jwhereis
			% cbsd jailmapdb
		

Should you manage more than one FreeBSD/cbsd node farm, you can generate a map with jail locations refering to the appropriate servers. The utility jlogin is used in order to search remote jails. This map can be used for a variety of tools, such as a custom admin panel, automatically documentating the farm, as well as a variety of services. For example, a Bacula jail can automatically search the map for new jails and create configuration for their backup; or when a jail migrates from one physical node to another the target host can be reconfigured with jails for backup without the need for manual interaction by the system administrator.

Currently, the easiest way to count traffic - use functional of ipfw count on the JID of necessary environment.

Necessary conditions for the implementation of this:

• loaded module ipfw.ko;
• mounted in CBSD (for example via cbsd initenv-tui) ipfw_enable parameters to 1;
• count the presence of the rules in ipfw before any other firewall rules.

CBSD starting and stopping the jails and removes automatically sets the rules for traffic jail, using a range of these rules settingCBSD (range by default fwcount_st="99" - fwcount_end="2000" )

In other words, if you want to count traffic and still have the ability to filter traffic, create filtering rules above 2000 and not taking rules from 99 to 2000.

Collect of traffic occurs 1 time per hour or when stopping the jail and stored in SQLite3 base, located in the system directory jail: $workdir/jails-system/$jname/traffic/YYYY-MM.sqlite, where YYYY, MM - year and month.

Example. Enjoying the traffic statistics for the jail kde4. meaning of the fields outgoing and incoming - in bytes:

root@home:/ # sqlite3 /usr/jails/jails-system/kde4/traffic/2014-09.sqlite 
SQLite version 3.8.6 2014-08-15 11:46:33
Enter ".help" for usage hints.

sqlite> .schema traffic
CREATE TABLE traffic (  dt TIMESTAMP DATE DEFAULT (datetime('now','localtime')) UNIQUE PRIMARY KEY, incoming integer, outgoing integer  );

sqlite> select * from traffic order by dt desc limit 15;
2014-09-20 15:00:52|142704274|4958246
2014-09-20 14:00:51|163907026|25242205
2014-09-20 13:00:49|3894888|182821
2014-09-20 05:49:53|58329247|41769720
2014-09-20 05:00:23|24247445|3464945
2014-09-20 04:00:56|67749758|39433640
2014-09-20 02:28:36|11767628|438283
2014-09-20 02:00:57|115675943|10809029
2014-09-20 01:00:54|279397568|156221677
2014-09-20 00:00:51|223665101|6232876
2014-09-19 23:00:50|250122634|8619979
2014-09-19 22:00:49|221508227|6458218
2014-09-19 01:00:42|64715837|3443253
2014-09-19 00:00:38|109266525|8541659
2014-09-18 23:00:34|99594683|20380707
sqlite>