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jessie_bind_chroot

Chrooted bind9 on Jessie

credits to: https://wiki.debian.org/Bind9

For Jessie, edit /etc/systemd/system/multi-user.target.wants/bind9.service to add options “-t /var/bind9/chroot”:

[Unit]
Description=BIND Domain Name Server
Documentation=man:named(8)
After=network.target

[Service]
ExecStart=/usr/sbin/named -f -u bind -t /var/bind9/chroot
ExecReload=/usr/sbin/rndc reload
ExecStop=/usr/sbin/rndc stop

[Install]
WantedBy=multi-user.target

For Jessie, after changing the above unit file, reload it with:

systemctl daemon-reload

Now create the chroot directory structure:

mkdir -p /var/bind9/chroot/{etc,dev,var/cache/bind,var/run/named,var/log}

Create the required device special files and set the correct permissions:

mknod /var/bind9/chroot/dev/null c 1 3
mknod /var/bind9/chroot/dev/random c 1 8
chmod 660 /var/bind9/chroot/dev/{null,random}
chown bind /var/bind9/chroot/dev/random

Move the current config directory into the new chroot directory:

mv /etc/bind /var/bind9/chroot/etc

Now create a symbolic link in /etc for compatibility:

ln -s /var/bind9/chroot/etc/bind /etc/bind 

If you want to use the local timezone in the chroot (e.g. for syslog):

cp /etc/localtime /var/bind9/chroot/etc/

Change the ownership on the files you've just moved over and the rest of the newly created chroot directory structure:

chown -R bind:bind /etc/bind/*
chmod 775 /var/bind9/chroot/var/{cache/bind,run/named}
chgrp bind /var/bind9/chroot/var/{cache/bind,run/named}

Edit the PIDFILE variable to the correct path:

PIDFILE=/var/bind9/chroot/var/run/named/named.pid

Finally tell rsyslog to listen to the bind logs in the correct place:

echo "\$AddUnixListenSocket /var/bind9/chroot/dev/log" > /etc/rsyslog.d/bind-chroot.conf

Restart rsyslog and start bind:

/etc/init.d/rsyslog restart; /etc/init.d/bind9 start

Logging

/etc/logrotate.d/named

/var/bind9/chroot/var/log/bind.log {
        daily
        compress
        delaycompress
        rotate 5
        missingok
        postrotate
                [ -e /etc/init.d/bind9 ] && /etc/init.d/bind9 reload > /dev/null 2>&1 || true
        endscript
}

/var/bind9/chroot/var/log/security_info.log {
        daily
        compress
        delaycompress
        rotate 5
        missingok
        postrotate
                [ -e /etc/init.d/bind9 ] && /etc/init.d/bind9 reload > /dev/null 2>&1 || true
        endscript
}

/var/bind9/chroot/var/log/update_debug.log {
        daily
        compress
        delaycompress
        rotate 5
        missingok
        postrotate
                [ -e /etc/init.d/bind9 ] && /etc/init.d/bind9 reload > /dev/null 2>&1 || true
        endscript
}

Long story short:

apt-get install bind9 bind9-doc
service bind9 stop
vi /etc/systemd/system/multi-user.target.wants/bind9.service

change ExecStart line to: ExecStart=/usr/sbin/named -f -u bind -t /var/bind9/chroot

systemctl daemon-reload
mkdir -p /var/bind9/chroot/{etc,dev,var/cache/bind,var/run/named,var/log}
mknod /var/bind9/chroot/dev/null c 1 3
mknod /var/bind9/chroot/dev/random c 1 8
chmod 660 /var/bind9/chroot/dev/{null,random}
chown bind /var/bind9/chroot/dev/random
mv /etc/bind /var/bind9/chroot/etc
ln -s /var/bind9/chroot/etc/bind /etc/bind 
dpkg-reconfigure tzdata
cp /etc/localtime /var/bind9/chroot/etc/
chown -R bind:bind /etc/bind/*
chmod 775 /var/bind9/chroot/var/{cache/bind,run/named}
chgrp bind /var/bind9/chroot/var/{cache/bind,run/named}
chown bind /var/bind9/chroot/dev/random
touch /var/bind9/chroot/var/log/{bind.log,update_debug.log,security_info.log}
ln -s /var/bind9/chroot/var/log/ /var/log/bind
chgrp bind /var/bind9/chroot/var/log/*.log
vi /etc/init.d/bind9

change PID line to: PIDFILE=/var/bind9/chroot/var/run/named/named.pid

echo "\$AddUnixListenSocket /var/bind9/chroot/dev/log" > /etc/rsyslog.d/bind-chroot.conf
/etc/init.d/rsyslog restart; /etc/init.d/bind9 start
  • Add the logrotate script from above
jessie_bind_chroot.txt · Last modified: 2016/01/25 09:33 by admin