Modifying the environment for Linux

systemd adaption:

As a root user, perform the following to adapt the autofs script:

1. Adapt start-dependency of autofs service:

   cp /usr/lib/systemd/system/autofs.service /etc/systemd/system
   chmod 664 /etc/systemd/system/autofs.service
   

   In /etc/systemd/system/autofs.service, change from:

   SLES 12.x:

   After=network.target remote-fs.target nss-lookup.target nss-user-lookup.target

   to:

   After=network.target remote-fs.target nss-lookup.target nss-user-lookup.target zebra.service ospfd.service

   RHEL 8.x:

   After=network.target ypbind.service sssd.service network-online.target remote-fs.target rpc-statd.service rpcbind.service

   to:

   After=network.target ypbind.service sssd.service network-online.target remote-fs.target rpc-statd.service rpcbind.service frr.service

   Then, check with command: systemd-delta systemd/system.

2. As you need to wait until the NFS server VIPA can be pinged before you can mount the SAP global file systems, we provide a sample testNFS.sh script, which is part of the zSAP_BusinessContinuity<nn>.zip package. The testNFS.sh script waits up to three minutes until the NFS server VIPA can be pinged. Copy the testNFS.sh script with correct permissions into the correct directory (in the example the target directory is /root) and provide the virtual NFS server host name as an script argument (in the example it is sapnfsv). You need to execute that testNFS.sh script before autofs.

   Create and save the file /etc/systemd/system/beforeafs.service (664 permissions), which contains:

   [Unit]
   Before=autofs.service
   [Service]
   Type=oneshot
   RemainAfterExit=true
   ExecStart=/bin/sh -c ’/root/testNFS.sh sapnfsv’
   # beware, executable is run directly, not through a shell, check the man pages
   # systemd.service and systemd.unit for full syntax
   [Install]
   # target in which to start the service
   WantedBy=multi-user.target
   #WantedBy=graphical.target
   

   Then, run systemctl daemon-reload.

   Check whether the beforeafs.service is enabled and active (running) with the command: systemctl status beforeafs.service.

   If beforeafs.service is not enabled or active, then run:

   systemctl enable beforeafs.service
   systemctl start beforeafs.service
   

   Additionally, in the same way check if autofs.service is enabled and active.

3. Adapt start-dependency of dynamic routing daemons

   SLES 12.x:

   It is necessary to have the zebra and ospfd services started after all wicked managed network interfaces are up. Therefore, as root user, do the following:

   Create and save the file /etc/systemd/system/zebra.service (664 permissions), which contains:

   [Unit]
   Description=GNU Zebra routing manager
   Wants=network.target
   After=network.target
   ConditionPathExists=/etc/quagga/zebra.conf
   [Service]
   Type=forking
   PIDFile=/run/quagga/zebra.pid
   EnvironmentFile=-/etc/sysconfig/quagga
   ExecStartPre=/sbin/ip route flush proto zebra
   ExecStart=/usr/sbin/zebra -d $ZEBRA_OPTS -f /etc/quagga/zebra.conf
   Restart=on-abort
   [Install]
   WantedBy=multi-user.target
   

   Then, run:

   systemctl daemon-reload

   With the following command, check if the zebra service is enabled and active (running):

   systemctl status zebra.service

   If the zebra service is enabled and active (running), then restart the ospfd service:

   systemctl restart ospfd.service

   If the zebra service is not enabled or active, then run:

   systemctl enable zebra.service
   systemctl start zebra.service
   systemctl restart ospfd.service
   

   RHEL 8.x:

   In order to start at boot time the FRR after the network is up, we did the following adaptions. First copy /usr/lib/systemd/system/frr.service to /etc/systemd/system/frr.service. Then, change the copied frr.services file. Here is the output of the diff command of both files (after the adaptions) in order to allow you to redo the changes in your copied frr.services file:

   diff /usr/lib/systemd/system/frr.service /etc/systemd/system/frr.service
   4,5c4,6
   < After=network-pre.target systemd-sysctl.service
   < Before=network.target
   ---
   > #After=network-pre.target systemd-sysctl.service
   > #Before=network.target
   > After=network-online.target
   

   Restart the FRR service.