Update cheatsheets

linux/dockerd

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# dockerd
+
+> A persistent process to start and manage docker containers.
+> More information: <https://docs.docker.com/engine/reference/commandline/dockerd/>.
+
+- Run docker daemon:
+
+`dockerd`
+
+- Run docker daemon and configure it to listen to specific sockets (UNIX and TCP):
+
+`dockerd --host unix://{{path/to/tmp.sock}} --host tcp://{{ip}}`
+
+- Run with specific daemon PID file:
+
+`dockerd --pidfile {{path/to/pid_file}}`
+
+- Run in debug mode:
+
+`dockerd --debug`
+
+- Run and set a specific log level:
+
+`dockerd --log-level={{debug|info|warn|error|fatal}}`