Jail management made bearable.
ezjail-admin config -r norun <JAIL_NAME>
You can limit the specific cores a jail uses but not a number of automatically scheduled ones. This can be done as a single core, a range of cores or a list cores.
ezjail-admin config -c <CORE_NUMBER> <JAIL_NAME>
Where <CORE_NUMBER> is the core number you want your jail on, with 0 being
the first and n-1 being the last should you have n cores, and <JAIL_NAME>
being the name of the ezjail-managed jail you want to set the affinity of.
ezjail-admin config -c <CORE_NUMBER_FIRST>-<CORE_NUMBER_LAST> <JAIL_NAME>
Where <CORE_NUMBER_FIRST> and <CORE_NUMBER_LAST> are the first and last
cores you want to run on respectively, and <JAIL_NAME> being the jail name.
ezjail-admin config -c <CORE_NUMBER_FIRST>,<CORE_NUMBER_SECOND>,...,<CORE_NUMBER_N> <JAIL_NAME>
Where core numbers like <CORE_NUMBER_FIRST>, <CORE_NUMBER_LAST>, and
<CORE_NUMBER_N> are the core numbers you want to run on, and <JAIL_NAME>
being the jail name.
There's a common issue arising every release upgrade with jails created in ezjail. The documentation is sparse in this regard. You'll know that you have a problem when you're running into the following error message:
/!\ ERROR: /!\
Ports Collection support for your FreeBSD version has ended, and no ports are guaranteed to build on this system. Please upgrade to a supported release.
No support will be provided if you silence this message by defining ALLOW_UNSUPPORTED_SYSTEM.
Instead of just using the environment variable ALLOW_UNSUPPORTED_SYSTEM, find
out what version of FreeeBSD you have running inside of the basejail:
grep FreeBSD_version /usr/include/sys/param.hYou'll get an output like the following:
#undef __FreeBSD_version
#define __FreeBSD_version 1101001 /* Master, propagated to newvers */
The first four numbers are what we're interested in, as they define the version
currently in use — 10.1 in this case.
Now that you know the current version in use, you need to let ezjail upgrade
from that version to the current host version. Since the kernel is shared
between the host and jails, you cannot run a newer version of FreeBSD inside a
jail than the host version.
To do so, run the following:
ezjail-admin update -U -s 11.1-RELEASEAfterwards, restart all jails for good measure:
ezjail-admin restart/etc/rc.d/jail: WARNING: Per-jail configuration via jail_* variables is obsolete. Please consider migrating to /etc/jail.conf.
sysrc jail_confwarn="NO"