Add Check If The Local Server Is Running as a Postgres til

postgres/check-if-the-local-server-is-running.md

@@ -0,0 +1,43 @@
+# Check If The Local Server Is Running
+
+An install of PostgreSQL comes with a number of utilities including the
+`pg_isready` command. This command can be used to check if the local PostgreSQL
+server is up, running, and ready to receive connections.
+
+If the server has not yet been started, running the command will result in a
+`no response` response.
+
+```bash
+$ pg_isready
+localhost:5432 - no response
+```
+
+In this case, the `pg_ctl` command can be used to start the server.
+
+```bash
+$ pg_ctl -D $HOME/.asdf/installs/postgres/12.3/data start
+waiting for server to start....
+
+...
+
+ done
+server started
+```
+
+It tells us that the server is started and we can confirm that by again running
+`pg_isready`.
+
+```bash
+$ pg_isready
+localhost:5432 - accepting connections
+```
+
+This command is most useful as part of a script, such as in a CI environment.
+In that case, you may not want it writing to `stdout`, you just want to use the
+command's exit code. For that, you can tack on the `--quiet` flag.
+
+```
+$ pg_isready --quiet
+```
+
+[source](https://www.postgresql.org/docs/current/app-pg-isready.html)