TrueNAS

TrueNAS Core

Jails

Jails are most similar to Linux Containers, and somewhat like Docker containers. Docker containers are meant to be destroyed and recreated constantly, whereas jails are not. Like Docker containers, you can mount directories from the host to the jail. Like Linux Containers, they each have their own IP address, unlike Docker containers which use their own internal networking or have ports mapped to the host IP address.

iocage

iocage is the jail manager of TrueNAS.

Get list of jails

sudo iocage list

Connect to jail console

sudo iocage console {JAIL-NAME}

Issue jail commands without an interactive console

sudo iocage exec {JAIL-NAME} {COMMAND}

Change jail's power state

sudo iocage <start,stop,restart> {JAIL-NAME}

Mount host directory in jail

sudo iocage fstab -a jailname source_location destination_location nullfs (rw/ro) 0 0

Create a new jail

sudo iocage create -n {NEW-JAIL-NAME} -r 11.3-RELEASE ip4_addr="vnet0|192.168.0.9/24" defaultrouter="192.168.0.1" vnet="on" allow_raw_sockets="1" boot="on"

Auto update jails

update-jails.sh

#!/bin/bash
declare -a vars
eval "vars=(`/usr/local/bin/iocage list | awk '{ print $4 }' | sed '2d' | grep .`)"
for ((I = 0; I < ${#vars[@]}; ++I )); do
    if /usr/local/bin/iocage exec "${vars[$I]}" "pkg update && pkg upgrade" | grep -q 'Your packages are up to date.'; then
        echo "No need to restart jails"
    else
        /usr/local/bin/iocage restart "${vars[$I]}"
    fi
done