From 92d732c7691564d8087eb3666faba270dcc25f8d Mon Sep 17 00:00:00 2001
From: jbranchaud <jbranchaud@gmail.com>
Date: Sat, 15 Mar 2025 14:03:55 -0500
Subject: [PATCH] Add Check Postgres Version Running In Docker Container as a
 Docker TIL

---
 README.md                                     |  3 +-
 ...res-version-running-in-docker-container.md | 28 +++++++++++++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 docker/check-postgres-version-running-in-docker-container.md

diff --git a/README.md b/README.md
index ba8a8ed..84e5bb2 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1618 TILs and counting..._
+_1619 TILs and counting..._
 
 See some of the other learning resources I work on:
 - [Ruby Operator Lookup](https://www.visualmode.dev/ruby-operators)
@@ -224,6 +224,7 @@ If you've learned something here, support my efforts writing daily TILs by
 
 ### Docker
 
+- [Check Postgres Version Running In Docker Container](docker/check-postgres-version-running-in-docker-container.md)
 - [Configure Different Host And Container Ports](docker/configure-different-host-and-container-ports.md)
 - [List Running Docker Containers](docker/list-running-docker-containers.md)
 - [Prevent Containers From Running On Startup](docker/prevent-containers-from-running-on-startup.md)
diff --git a/docker/check-postgres-version-running-in-docker-container.md b/docker/check-postgres-version-running-in-docker-container.md
new file mode 100644
index 0000000..e8f9bd8
--- /dev/null
+++ b/docker/check-postgres-version-running-in-docker-container.md
@@ -0,0 +1,28 @@
+# Check Postgres Version Running In Docker Container
+
+I have a docker container that I'm using to run a PostgreSQL development
+database on my local machine. It was a while ago when I set it up, so I can't
+remember specifically which major version of PostgreSQL I am using.
+
+I use `docker ps` to list the names of each container.
+
+```bash
+$ docker ps --format "{{.Names}}"
+still-postgres-1
+better_reads-postgres-1
+```
+
+I grab the one I am interested in. In this case, that is `still-postgres-1`.
+
+Then I can execute a `select version()` statement with `psql` against the
+container with that name like so:
+
+```bash
+$ docker exec still-postgres-1 psql -U postgres -c "select version()";
+                                                       version                                                 
+---------------------------------------------------------------------------------------------------------------------
+ PostgreSQL 16.2 (Debian 16.2-1.pgdg120+2) on x86_64-pc-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit
+(1 row)
+```
+
+And there I have it. I'm running Postgres v16 in this container.