[Polkadot Wiki Migration] Using Systemd

infrastructure/validators/onboarding/.pages

@@ -1,3 +1,4 @@
 title: Onboarding
 nav:
   - index.md
+  - run-validator

infrastructure/validators/onboarding/run-validator/.pages

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+title: Running Validators
+nav:
+  - index.md
+  - using-systemd.md

infrastructure/validators/onboarding/run-validator/index.md

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+---
+title: Run a Validator
+description: TODO
+hide: 
+- feedback
+template: subsection-index-page.html
+---

infrastructure/validators/onboarding/run-validator/using-systemd.md

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+---
+title: Use Systemd
+description: Using a service manager, such as systemd to streamline the management of your Polkadot node as a process on your Linux host machine.
+---
+
+You can run your validator as a [systemd](https://en.wikipedia.org/wiki/Systemd){target=\_blank} process so that it will automatically restart on server reboots or crashes (and helps to avoid getting [slashed](TODO:update-path){target=\_blank}).
+
+Before following this guide you should have already set up your validator by following the [How to Validate](TODO:update-path){target=\_blank} article.
+
+First create a new unit file called `polkadot-validator.service` in `/etc/systemd/system/`.
+
+```bash
+touch /etc/systemd/system/polkadot-validator.service
+```
+
+In this unit file you will write the commands that you want to run on server boot / restart.
+
+```
+[Unit]
+Description=Polkadot Validator
+
+[Service]
+ExecStart=PATH_TO_POLKADOT_BIN --validator --name SHOW_ON_TELEMETRY
+Restart=always
+RestartSec=120
+
+[Install]
+WantedBy=multi-user.target
+```
+
+!!!warning
+    It is recommended to delay the restart of a node with `RestartSec` in the case of node crashes. It's possible that when a node crashes, consensus votes in GRANDPA aren't persisted to disk. In this case, there is potential to equivocate when immediately restarting. What can happen is the node won't recognize votes that didn't make it to disk, and will then cast conflicting votes. Delaying the restart will allow the network to progress past potentially conflicting votes, at which point other nodes won't accept them.
+
+To enable this to start on booting your machine, run:
+
+```bash
+systemctl enable polkadot-validator.service
+```
+
+Start it manually with:
+
+```bash
+systemctl start polkadot-validator.service
+```
+
+You can check that it's working with:
+
+```bash
+systemctl status polkadot-validator.service
+```
+
+You can tail the logs with [`journalctl`](https://www.freedesktop.org/software/systemd/man/latest/journalctl.html){target=\_blank} (a tool to print log entries from the `systemd` journal) like so:
+
+```bash
+journalctl -f -u polkadot-validator
+```
+
+Now, you can monitor and manage a Polkadot validator as you would any other service on your Linux host.