jail.conf

host.hostname="$name"; #each of my jail has its own hostname as its name below, like; nginxsrv {}
path="/jails/$name"; #my jails are located in /jails/
exec.consolelog = "/var/log/jails/$name.console.log"; #each jail has its own console log file within /var/log/jails (create that directory)
mount.fstab = "/usr/local/etc/jails/fstab.$name"; #each jail has its own fstab file (create the mentioned directory)
persist; #keep the jails running even if they have no process actively running

exec.timeout=30;
stop.timeout=30;
exec.created="logger Jail $name has started!";
exec.poststop="logger Jail $name has stopped!";
exec.start = "/bin/sh /etc/rc";
exec.stop = "/bin/sh /etc/rc.shutdown";
exec.clean;
exec.system_user = "root";
exec.jail_user = "root";

mount.devfs;
devfs_ruleset="4";
mount.fdescfs; #that's for bash shell
allow.chflags;
allow.mount;
allow.mount.tmpfs;

allow.reserved_ports; #The jails root may bind to ports lower than 1024.
allow.set_hostname="1";
allow.raw_sockets; #allow ping-pong
allow.socket_af;
enforce_statfs=1;

#mount.procfs;
#allow.mount.nullfs; # we don't need allow.mount.nullfs to mount_nullfs via mount.fstab
#allow.mount.zfs; # only needed if we use ZFS mounts - we don't need this *unless* this is our poudriere jail
#allow.read_msgbuf; # allow reading host's dmesg outputs within the jails - use it only if it's truly needed

#allow.sysvipc;        #PostgreSQL needs this (needs access to shared memory), but a better solution:
# A process within the jail has access to System V IPC primitives.
# This is deprecated in favor of the per-mod-ule parameters.
# When this parameter is set, it's equivalent to setting sysvmsg, sysvsem, and sysvshm all to "inherit" which might be dangerous.
# So, setting sysv* = new is much better.
sysvmsg=new;
sysvsem=new;
sysvshm=new;

nginxsrv {
        ip4.addr = lo1|10.10.10.2;
        jid = 1;

}

phpserver {
        ip4.addr = lo1|10.10.10.3;
        jid = 2;
}

sqlserver {
        ip4.addr = lo1|10.10.10.4;
        jid = 3;
}