Jails

To run latest Minecraft 1.12.1 (as of this writing) within FreeBSD Jail you need few things. First of, you need to install Java 8: pkg install openjdk8 openjdk8-jre After Java is installed, you’ll notice that there’s a warning like: This OpenJDK implementation requires fdescfs(5) mounted on /dev/fd and procfs(5) mounted on /proc. If you have not done it yet, please do the following: mount -t fdescfs fdesc /dev/fd mount -t procfs proc /proc To make it permanent, you need the following lines in /etc/fstab: fdesc /dev/fd fdescfs rw 0 0 proc /proc procfs rw 0 0 This obviously needs to be done on the host system level as it is not allowed within Jail. Everything is clearly explain so I’ll not go point by point here. Prerequisite for mounting procfs is to load linprocfs kernel module, so before doing the thing above load module with: ...

This one is fairly simple. All of thee zone info files are located in /usr/share/zoneinfo/, divided by region. I’m in Croatia so setting up time to be the same as in Zagreb is done by sym-linking appropriate zone file to /etc/localtime: ln -sf /usr/share/zoneinfo/Europe/Zagreb /etc/localtime As I use jails on FreeBSD, to avoid setting this up on every single jail, I have flavor within ezjail defined which has default settings that I usually have on all jails. Time zone is one of those things and can be defined with: ...

To install and run PostgreSQL in FreeBSD jail you’ll need to enable allow.sysvipc system tuneable on that specific jail: List jails: jls Note jail ID and use following command to enable it for that running jail: jail -m jid=JAILID allow.sysvipc=1 This can also be accomplished by changing ezjail jail configuration file /usr/local/etc/ezjail/JAILNAME, ensure it contains: export jail_JAILNAME_parameters="allow.sysvipc=1" Install appropriate version of PostgreSQL. There are many different versions but I’ll use 9.6. To install it use: ...

Instead of adding all IP addresses statically to your server via host’s /etc/rc.conf file you may instead leave them out and specify them on per-jail basis. That way when Jail is started IP address gets assigned to specific network interface, and when it is shut down it disappears from that interface. This comes in really handy especially when you’re managing lots of IPv6 only jails, adding all IP addresses to the interface could be tedious and your rc.conf would be more so. ...