Update cheatsheets

tldr/linux/lvmpersist

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# lvmpersist
+
+> Manage persistent reservations (PR) on block devices or all PVs in a volume group.
+> More information: <https://manned.org/lvmpersist>.
+
+- Start PR on all PVs in a VG with a local key (exclusive access by default):
+
+`lvmpersist start --ourkey {{0x1234abcd}} --vg {{vg_name}}`
+
+- Start PR for a shared VG (allow multiple hosts):
+
+`lvmpersist start --ourkey {{0x1234abcd}} --access {{sh}} --vg {{vg_name}}`
+
+- Stop PR on a VG and unregister the local key:
+
+`lvmpersist stop --ourkey {{0x1234abcd}} --vg {{vg_name}}`
+
+- Take over a local VG by preempting another host while starting PR:
+
+`lvmpersist start --ourkey {{0xmy_key}} --removekey {{0xother_key}} --vg {{vg_name}}`
+
+- Remove another host's key from a shared VG:
+
+`lvmpersist remove --ourkey {{0xmy_key}} --removekey {{0xother_key}} --vg {{vg_name}}`
+
+- Show registered keys and reservations for a VG:
+
+`lvmpersist read --vg {{vg_name}}`
+
+- Operate on specific devices instead of a VG:
+
+`lvmpersist start --ourkey {{0x1234abcd}} --device {{/dev/sdX}} --device {{/dev/mapper/mpathY}}`

tldr/linux/systemctl-try-reload-or-restart

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl try-reload-or-restart
+
+> Reload one or more units if they support it; otherwise restart them.
+> More information: <https://www.freedesktop.org/software/systemd/man/latest/systemctl.html#try-reload-or-restart%20PATTERN%E2%80%A6>.
+
+- Reload or restart a specific unit:
+
+`systemctl try-reload-or-restart {{unit}}`
+
+- Reload or restart multiple units:
+
+`systemctl try-reload-or-restart {{unit1 unit2 ...}}`
+
+- Reload or restart all units matching a pattern:
+
+`systemctl try-reload-or-restart '{{pattern}}'`

tldr/linux/systemctl-try-restart

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl try-restart
+
+> Restart one or more units only if they are currently running.
+> More information: <https://www.freedesktop.org/software/systemd/man/latest/systemctl.html#try-restart%20PATTERN%E2%80%A6>.
+
+- Restart a specific unit if it is running:
+
+`systemctl try-restart {{unit}}`
+
+- Restart multiple units if they are running:
+
+`systemctl try-restart {{unit1 unit2 ...}}`
+
+- Restart all units matching a pattern if they are running:
+
+`systemctl try-restart '{{pattern}}'`