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--- en:linux:nfs_unique_machineid [2020/05/06 01:26] – alex
+++ en:linux:nfs_unique_machineid [2020/05/06 01:59] (current) – alex
@@ Line 1: / Line 1: @@
 ====== Unique machine ID for nfs root systems ======
+When multiple hosts running systemd share the same NFS root, they will also share the same machine-id.  This can cause issues, especially with journald.  Journald logging can be disabled by deleting ''/var/log/journal'' which solves most of the problems, but a better solution is to use unique machine-id values on all of the hosts.  Modern motherboards provide a unique UUID accessible via DMI, so a reasonable option is to write this out to /run during boot and point systemd at that as the machine-id.  Here is a simple way to set that up.
+Create the file ''/etc/initramfs-tools/scripts/init-top/machineid'':
 <code bash machineid>
@@ Line 26: / Line 28: @@
 </code>
-<code>
+Rebuild the initramfs (for example ''update-initramfs -u'') and replace ''/etc/machine-id'' and ''/var/lib/dbus/machine-id'' with symlinks to ''/run/machine-id''.
-# ln -sf /run/machine-id /etc/machine-id
-# ln -sf /run/machine-id /var/lib/dbus/machine-id
-</code>