grep mysqld /var/log/syslog | tail
Jul 15 20:38:45 sql mysqld_safe[1529]: started
Jul 15 20:38:45 sql mysqld[1533]: 100715 20:38:45 [ERROR] Fatal error: Can't change to run as user 'mysql' ;  Please check that the user exists!
Jul 15 20:38:45 sql mysqld[1533]:  
Jul 15 20:38:45 sql mysqld[1533]: 100715 20:38:45 [ERROR] Aborting
Jul 15 20:38:45 sql mysqld[1533]:  
Jul 15 20:38:45 sql mysqld[1533]: 100715 20:38:45 [Note] /usr/sbin/mysqld: Shutdown complete
Jul 15 20:38:45 sql mysqld[1533]:  
Jul 15 20:38:45 sql mysqld_safe[1535]: ended
Jul 15 20:38:59 sql /etc/init.d/mysql[1670]: error: 'Can't connect to local MySQL server through socket '/var/chroot/mysql/var/run/mysqld/mysqld.sock' (2)'
Jul 15 20:38:59 sql /etc/init.d/mysql[1670]: Check that mysqld is running and that the socket: '/var/chroot/mysql/var/run/mysqld/mysqld.sock' exists!

useradd -g mysql mysql
useradd: user mysql exists

groupadd mysql
groupadd: group mysql exists

  # invoke-rc.d mysql stop
  # mkdir -p /var/chroot/mysql/{etc,lib,lib64,tmp,usr/lib,usr/share,var/lib,var/log/mysql,var/run}
  # grep '^mysql:' /etc/passwd > /var/chroot/mysql/etc/passwd
  # cp /etc/localtime /var/chroot/mysql/etc/
  # echo -e "127.0.0.1\tlocalhost\n10.1.1.201\tweb.localdomain web\n10.1.1.202\tsql.localdomain sql" > /var/chroot/mysql/etc/hosts
  # mv /var/lib/mysql /var/chroot/mysql/var/lib/
  # ln -s /var/chroot/mysql/var/lib/mysql/ /var/lib/mysql
  # mv /var/run/mysqld /var/chroot/mysql/var/run/
  # ln -s /var/chroot/mysql/var/run/mysqld/ /var/run/mysqld
  # mv /usr/share/mysql /var/chroot/mysql/usr/share/
  # ln -s /var/chroot/mysql/usr/share/mysql/ /usr/share/mysql
  # chown mysql:mysql /var/chroot/mysql/var/lib/mysql
  # chown mysql:adm /var/chroot/mysql/var/log/mysql
  # chown mysql:root /var/chroot/mysql/var/run/mysqld
  # chmod 2750 /var/chroot/mysql/var/log/mysql/
  # chmod 1777 /var/chroot/mysql/tmp/
  # touch /var/chroot/mysql/var/log/mysql.{err,log}
  # chmod 640 /var/chroot/mysql/var/log/mysql.{err,log}
  # chown root:adm /var/chroot/mysql/var/log/mysql.err
  # chown mysql:adm /var/chroot/mysql/var/log/mysql.log
  # ldd /usr/sbin/mysqld
        linux-vdso.so.1 =>  (0x00007fffffffe000)
        librt.so.1 => /lib/librt.so.1 (0x00007f27d7ff7000)
        libz.so.1 => /usr/lib/libz.so.1 (0x00007f27d7de0000)
        libwrap.so.0 => /lib/libwrap.so.0 (0x00007f27d7bd7000)
        libdl.so.2 => /lib/libdl.so.2 (0x00007f27d79d3000)
        libpthread.so.0 => /lib/libpthread.so.0 (0x00007f27d77b7000)
        libcrypt.so.1 => /lib/libcrypt.so.1 (0x00007f27d757f000)
        libnsl.so.1 => /lib/libnsl.so.1 (0x00007f27d7367000)
        libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f27d705b000)
        libm.so.6 => /lib/libm.so.6 (0x00007f27d6dd8000)
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00007f27d6bc1000)
        libc.so.6 => /lib/libc.so.6 (0x00007f27d686e000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f27d8200000)
  # cp /lib64/ld-linux-x86-64.so.2 /var/chroot/mysql/lib64/
  # cp /usr/lib/libz.so.1 /usr/lib/libstdc++.so.6 /var/chroot/mysql/usr/lib/
  # cp /lib/librt.so.1 /lib/libwrap.so.0 /lib/libdl.so.2 /lib/libpthread.so.0 /lib/libcrypt.so.1 /lib/libnsl.so.1 /lib/libm.so.6 /lib/libgcc_s.so.1 /lib/libc.so.6 /var/chroot/mysql/lib/
  # vim /etc/mysql/debian.cnf
  socket   = /var/chroot/mysql/var/run/mysqld/mysqld.sock
  # vim /etc/mysql/my.cnf
  [client]
  socket   = /var/chroot/mysql/var/run/mysqld/mysqld.sock
  [mysqld]
  chroot   = /var/chroot/mysql/
  # invoke-rc.d mysql start