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en:linux:nfs_unique_machineid [2020/05/06 03:26] alex |
en:linux:nfs_unique_machineid [2020/05/06 03:40] alex |
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| ====== Unique machine ID for nfs root systems ====== | ====== 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> | <code bash machineid> | ||
| Line 26: | Line 28: | ||
| </code> | </code> | ||
| - | <code> | + | Rebuild the initramfs (for example ''update-initramfs -c -k 4.15.0-99-generic'') 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> | + | |