Add 'README.move-to-another-server'.

README.move-to-another-server

@@ -0,0 +1,84 @@
+# ------------------------------------------
+# Moving LXC containers between host systems
+# ------------------------------------------
+
+lxc_name=d.mx.oopen.de
+
+lxc_base_dir_old_system="/data/lxc"
+lxc_base_dir_new_system="/data/lxc"
+
+new_host_system="o35.oopen.de"
+
+# ---
+# old host system
+# ---
+
+# Shutdown the container on old system
+#
+lxc-stop -n $lxc_name
+
+
+# Archive container (rootfs & config)
+#
+# Note!:
+# The --numeric-owner flag is very important! Without it, the container may not 
+# boot because the uid/gids get mangled in the extracted filesystem. 
+#
+# When tar creates an archive, it preserves user / group ownership information. 
+# By default, when extracting, tar tries to resolve the archive user/group ownership 
+# names with the ids on the system running tar. This is intended to ensure that user 
+# ownership is resolved on the new system, in case the UID numeric values differ b
+# etween systems.
+#
+# This is bad for an LXC filesystem because the numeric uid/gid ownership is intended 
+# to be preserved for the whole filesystem. If it gets resolved to a different value, 
+# bad things happen.
+#
+cd "$lxc_base_dir_old_system"
+tar --numeric-owner -czvf $lxc_name_fs.tar.gz $lxc_name
+
+
+# Copy the created archive to your new server
+#
+rsync -avh $lxc_name_fs.tar.gz ${new_host_system}:${lxc_base_dir_new_system}/
+
+
+# ---
+# new host system
+# ---
+
+# Extract rootfs (including the lxc config  file)
+#
+cd "${lxc_base_dir_new_system}"
+gunzip < $lxc_name_fs.tar.gz | tar --numeric-owner -xvf -
+
+
+# ---
+# Replace old ip-addresses with the new one
+# ---
+
+old_ipv4="83.223.86.92"
+new_ipv4="95.217.204.227"
+old_ipv6="2a01:30:0:13:254:9eff:fed5:e7fd"
+new_ipv6="2a01:4f9:4a:47e5::227"
+
+replace_base_dir="/data/lxc/d.mx/rootfs"
+
+replace_ip_files="
+   ${replace_base_dir}//etc/amavis/conf.d/50-user
+   ${replace_base_dir}//etc/ipt-firewall/interfaces_ipv4.conf
+   ${replace_base_dir}//etc/munin/munin-node.conf
+   ${replace_base_dir}//etc/postfix/main.cf
+   ${replace_base_dir}//etc/postfix/master.cf
+   ${replace_base_dir}//etc/spamassassin/local.cf
+   ${replace_base_dir}//usr/local/apache2/conf/extra/httpd-info.conf
+   ${replace_base_dir}//usr/local/apache2/conf/vhosts/*.conf
+"
+
+for _file in $replace_ip_files ; do
+   if [[ -f "$_file" ]]; then
+      perl -i -n -p -e "s/${old_ipv4}/${new_ipv4}/g" $_file
+      perl -i -n -p -e "s/${old_ipv6}/${new_ipv6}/g" $_file
+   fi 
+done
+