Merge pull request 'docker swarm' (#14) from feat/add-docker into main

Reviewed-on: #14

.github/workflows/pipeline.yml

@@ -80,13 +80,35 @@ jobs:
         echo "$SSH_PRIVATE_KEY" > private.key
         sudo chmod 400 private.key
 
-    - name: Setup Nomad
-      uses: hashicorp/setup-nomad@main
-      with:
-        nomad_version: '1.10.5'
-
-    - name: Deploy Job to Nomad
-      run: |
-        nomad job run -var="version=${{ github.sha }}" infra/nomad/code-snippets.nomad.hcl
+    - name: Write Ansible Inventory To File
       env: 
-        NOMAD_ADDR: ${{ secrets.NOMAD_ADDR }}
+        APP_HOST: ${{ secrets.APP_HOST }}
+      run: |
+        echo "[app]" > hosts.ini
+        echo "$APP_HOST" >> hosts.ini
+
+    - name: Install Ansible
+      run: |
+        sudo apt-add-repository ppa:ansible/ansible -y
+        sudo apt-get update -y
+        sudo apt-get install ansible -y
+
+    - name: Run Ansible Playbook to Configure Servers
+      run: |
+        export ANSIBLE_HOST_KEY_CHECKING=False # Disable host key checking
+        ansible-playbook infra/ansible/deploy-playbook.yml --private-key private.key --inventory hosts.ini
+      env: 
+        APP_HOST: ${{ secrets.APP_HOST }}
+        REGISTRY_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+        REGISTRY_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
+
+    # - name: Setup Nomad
+    #   uses: hashicorp/setup-nomad@main
+    #   with:
+    #     nomad_version: '1.10.5'
+
+    # - name: Deploy Job to Nomad
+    #   run: |
+    #     nomad job run -var="version=${{ github.sha }}" infra/nomad/code-snippets.nomad.hcl
+    #   env: 
+    #     NOMAD_ADDR: ${{ vars.NOMAD_ADDR }}

.vitepress/config.mts

@@ -76,6 +76,10 @@ export default defineConfig({
           { text: 'Local DB (PostgreSQL)', link: '/docker/local-db-pg' },
         ]
       },
+      {
+        text: 'Docker Swarm',
+        link: '/docker-swarm/',
+      },
       {
         text: 'EF Core',
         link: '/ef-core/',

docs/docker-swarm/index.md

@@ -0,0 +1,27 @@
+# Docker Swarm Snippets and Musings
+
+## Updating Services
+
+View services:
+
+```bash
+docker service ls
+```
+
+To scale a service up or down:
+
+```bash
+docker service scale <service_name>=<number_of_replicas>
+```
+
+Sometimes services get stuck or need to be forcefully updated:
+
+```bash
+docker service update --force <service_name>
+```
+
+::: tip
+
+Sometimes if you need to force containers to restart use the update force (e.g. after restarting a node).
+
+:::

docs/index.md

@@ -26,6 +26,10 @@ hero:
       text: Docker
       link: /docker/
 
+    - theme: alt
+      text: Docker Swarm
+      link: /docker-swarm/
+
     - theme: alt
       text: EF Core
       link: /ef-core/

docs/postgres/dump-and-restore.md

@@ -2,20 +2,38 @@
 
 Handy commands for dumping and restoring Postgres databases.
 
-:::info
+::: info
 Most of these commands are run using Docker as then we don't need to have Postgres installed locally.
 
 If a different version of Postgres is needed, just change the version number in the Docker image tag.
 :::
 
+## Setup 
+
+Create a pgpass file in the current directory with the following content:
+
+```
+<server>:<port>:<database>:<username>:<password>
+```
+
+::: tip
+Use `*` as a wildcard for any of the fields except for the password.
+:::
+
 ## Dumping a Database
 
 ```bash
-docker run --network host --rm -v .:/tmp -e PGPASSWORD=mysecretpassword postgres:16 pg_dump -h localhost -U myuser -d mydb -f /tmp/dump.sql
+docker run --network host --rm -v .:/tmp -v ./pgpass:/root/.pgpass -e PGPASSFILE=/root/.pgpass postgres:16 bash -c "chmod 600 /root/.pgpass && pg_dump -h <server> -p <port> -U <username> <database> -f /tmp/$(date +%Y%m%d_%H%M%S)_<database>_dump.sql -c --if-exists"
 ```
 
-## Restoring a Database
+## Dumping a Cluster
 
 ```bash
-docker run --network host --rm -v .:/tmp -e PGPASSWORD=mysecretpassword postgres:16 psql -h localhost -U myuser -d mydb -f /tmp/dump.sql
+docker run --network host --rm -v .:/tmp -v ./pgpass:/root/.pgpass -e PGPASSFILE=/root/.pgpass postgres:16 bash -c "chmod 600 /root/.pgpass && pg_dumpall -h <server> -p <port> -U <username> -f /tmp/$(date +%Y%m%d_%H%M%S)_<server>_cluster_dump.sql -c --if-exists"
+```
+
+## Restoring from a SQL Dump
+
+```bash
+docker run --network host --rm -v .:/tmp -v ./pgpass:/root/.pgpass -e PGPASSFILE=/root/.pgpass postgres:16 bash -c "chmod 600 /root/.pgpass && psql -h <server> -p <port> -U <username> <database> -f /tmp/dump.sql -X"
 ```

infra/nomad/code-snippets.nomad.hcl

@@ -1,12 +1,12 @@
+variable "version" {
+type    = string
+default = "latest"
+}
+
 job "code-snippets" {
   datacenters = ["dc1"]
   type        = "service"
 
-  variable "version" {
-    type    = string
-    default = "latest"
-  }
-
   group "code-snippets" {
     count = 1