How to migrate a Linux Mid server from one server to another with minimum downtime - Support and Troubleshooting

How to migrate a Linux Mid server from one server to another with minimum downtime Issue There are situations when a MID Server running on an Linux server with resource limitation constraints or hardware preemptive failures must be migrated, with minimum downtime, to a complete new Linux server. The requirements for accomplish this switch from an old Linux server to a new Linux server are as follows:

The new Linux server is meeting the requirements for MID Server installation: Install a MID Server on Linux The network connectivity is already validated: KB0970162 - Prepare network connections for MID Servers Access as root on both Linux hosts running OLD and NEW MID Servers is granted. Release Paris onwards Resolution ON OLD SERVER

Open a console on the Linux host running the MID Server java processes and switch user to the linux servicenow user

#1 - stop the midserver (as linux servicenow user if RUN_AS_USER= is used) cd cd bin ./mid.sh stop

#2 - create a failsafe archive for all the files and folders from agent (as root) cd cd .. && tar -czvf oldsrv_failsafe_backup.tar.gz ./agent

#3 - disable the automatic startup (as root) cd cd bin ./mid.sh remove

#4 - compress configuration files needed for switch over to new Mid Server (as root user) cd tar -cvf backup_old_mid_server.tar.gz config.xml conf keystore jre/lib/security tar -tvf backup_old_mid_server.tar.gz

ON NEW Server

#1 - create directory structure and download the FULL Mid Server package by using the "ZIP" link from Downloads module link from instance: https:// .service-now.com/mid_server_download_ui.do

#2 - create directories and unpack the archive (as root): mkdir -p /opt/servicenow/mid cd /opt/servicenow/mid wget https:// tar -xvf .zip.

#3 - remove the following files (as root user) cd rm -fr conf config.xml keystore jre/lib/security

#4 - copy the archive backup_old_mid_server.tar.gz (from OLD Server) into / and extract the files (as root user) cd tar -xvf backup_old_mid_server.tar.gz

-------------------------------------------------------------------------------------------- If the MID Server is running with root authority then the following 2 steps should be skipped. - modify user and group of processes of MID Server by updating /bin/mid.shconf_override RUN_AS_USER= GROUP_NAME= - change ownership of the agent directory (as root) chown . -R --------------------------------------------------------------------------------------------

#4 - install the systemd autostart script cd cd bin ./mid.sh install systemctl daemon-reload

#5 - start the midserver (as linux servicenow user if RUN_AS_USER= is used) cd cd bin ./mid.sh start

ON INSTANCE

* - Accept and resolve the issues related to change of and version * - Re-key the MID Server and validate.