Udemy Course Docker Mastery: with Kubernetes+Swarm from a Docker Captain

Build, test, and deploy containers with the best mega-course on Docker, Kubernetes, Compose, Swarm and Registry using a cloud native DevOps mindset

This repository is for use in my Udemy Courses "Docker Mastery" and "Swarm Mastery"

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Course Sections

1. Quick Start!
   1. README
   2. Commands and Links
2. Course Introduction
3. The Best Way to Setup Docker for Your OS
4. Creating and Using Containers Like a Boss
5. Container Images, Where To Find Them and How To Build Them
6. Container Lifetime & Persistent Data: Volumes, Volumes, Volumes
7. Making It Easier with Docker Compose: The Multi-Container Tool
8. Swarm Intro and Creating a 3-Node Swarm Cluster
9. Swarm Basic Features and How to Use Them In Your Workflow
10. Swarm App Lifecycle
11. Container Registries: Image Storage and Distribution
12. Docker in Production
13. The What and Why of Kubernetes
14. Kubernetes Architecture and Install
15. Your First Pods
16. Inspecting Kubernetes Resources
17. Exposing Kubernetes Ports
18. Kubernetes Management Techniques
19. Moving to Declarative Kubernetes YAML
20. Your Next Steps and The Future of Kubernetes
21. Automated CI Workflows
22. GitHub Actions Workflow Examples
23. Docker Security Good Defaults and Tools
24. Docker 19.03 Release New Features
25. DevOps and Docker Clips
26. Dockerfiles and Docker Images in 2022
27. Dockerfile and Compose File Reviews
28. Extra's, Common Questions, and Resources

IPv4 address for enp0s3: 192.168.1.192 IPv6 address for enp0s3: 2a00:a041:e92d:9e00:a00:27ff:fec5:80e0

Expanded Security Maintenance for Applications is not enabled.

33 updates can be applied immediately. To see these additional updates run: apt list --upgradable

Enable ESM Apps to receive additional future security updates. See https://ubuntu.com/esm or run: sudo pro status

Last login: Tue Dec 2 06:05:57 2025 from 192.168.1.247 adminov@ubuntuSVR1225DockerEngine:$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d220174fdd44 redis:3.2 "docker-entrypoint.s…" 50 minutes ago Up 50 minutes 6379/tcp redis.3.13a45cm7fmmhq6scy8s8au7l4 7e46292bbce2 nginx:latest "/docker-entrypoint.…" About an hour ago Up About an hour 80/tcp vote.2.gfeu6gbyvemfk8asy55n6imeh adminov@ubuntuSVR1225DockerEngine:$ docker service ls ID NAME MODE REPLICAS IMAGE PORTS hz81un2853ae redis replicated 3/3 redis:3.2 f0zfcja7btf8 result replicated 1/1 dockersamples/examplevotingapp_result:before *:5001->80/tcp rc32mw7ldfmp vote replicated 3/3 nginx:latest *:80->80/tcp 359zql8dee40 worker replicated 1/1 dockersamples/examplevotingapp_worker:latest adminov@ubuntuSVR1225DockerEngine:$ docker volume rm db-data db-data adminov@ubuntuSVR1225DockerEngine:$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d220174fdd44 redis:3.2 "docker-entrypoint.s…" 50 minutes ago Up 50 minutes 6379/tcp redis.3.13a45cm7fmmhq6scy8s8au7l4 7e46292bbce2 nginx:latest "/docker-entrypoint.…" About an hour ago Up About an hour 80/tcp vote.2.gfeu6gbyvemfk8asy55n6imeh adminov@ubuntuSVR1225DockerEngine:$ docker service rm db Error response from daemon: service db not found adminov@ubuntuSVR1225DockerEngine:$ docker service create --name db --network backend --mount type=volume,source=db-data,target=/var/lib/postgresql/data -e POSTGRES_PASSWORD=mypassword postgres:latest 623257lrp5dib0amtwcxzixe7 overall progress: 0 out of 1 tasks 1/1: ready [======================================> ] verify: Detected task failure ^COperation continuing in background. Use docker service ps 623257lrp5dib0amtwcxzixe7 to check progress. adminov@ubuntuSVR1225DockerEngine:$ ^C adminov@ubuntuSVR1225DockerEngine:$ docker service rm db db adminov@ubuntuSVR1225DockerEngine:$ docker volume create db-data db-data adminov@ubuntuSVR1225DockerEngine:$ docker service create --name db --network backend --mount type=volume,source=db-datoverall progress: 0 out of 1 tasks 1/1: assigned [======================> ] verify: Detected task failure ^COperation continuing in background.=======================> ] adminov@ubuntuSVR1225DockerEngine:$ ^C adminov@ubuntuSVR1225DockerEngine:$ ^C adminov@ubuntuSVR1225DockerEngine:~$ docker run --rm -it \

-v db-data:/var/lib/postgresql/data
-e POSTGRES_PASSWORD=mypassword
-e POSTGRES_USER=admin
-e POSTGRES_DB=mydb
postgres:16 Unable to find image 'postgres:16' locally 16: Pulling from library/postgres a9fe86bc7f87: Pull complete 115db6d16b77: Pull complete 9bb5da4cc6c3: Pull complete ef2bcb52083b: Pull complete 9d6744175495: Pull complete 49c4e00df3b4: Pull complete 2b3e79aa53c6: Pull complete 34fde4663855: Pull complete 65e5c9408eb3: Pull complete 2edb059d627d: Pull complete 5e588012c944: Pull complete e8ff652dc231: Pull complete a2e54379c540: Pull complete b85d0e635948: Download complete a6f7ddee4bf8: Download complete Digest: sha256:cf2a05fe40887b721e4b3dbac8fd32673c08292dcc8ba6b62b52b7f640433bd0 Status: Downloaded newer image for postgres:16 The files belonging to this database system will be owned by user "postgres". This user must also own the server process.

The database cluster will be initialized with locale "en_US.utf8". The default database encoding has accordingly been set to "UTF8". The default text search configuration will be set to "english".

Data page checksums are disabled.

fixing permissions on existing directory /var/lib/postgresql/data ... ok creating subdirectories ... ok selecting dynamic shared memory implementation ... posix selecting default max_connections ... 100 selecting default shared_buffers ... 128MB selecting default time zone ... Etc/UTC creating configuration files ... ok running bootstrap script ... ok performing post-bootstrap initialization ... ok syncing data to disk ... ok

initdb: warning: enabling "trust" authentication for local connections initdb: hint: You can change this by editing pg_hba.conf or using the option -A, or --auth-local and --auth-host, the next time you run initdb.

Success. You can now start the database server using:

pg_ctl -D /var/lib/postgresql/data -l logfile start

waiting for server to start....2025-12-02 11:42:10.215 UTC [47] LOG: starting PostgreSQL 16.11 (Debian 16.11-1.pgdg13+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 14.2.0-19) 14.2.0, 64-bit 2025-12-02 11:42:10.219 UTC [47] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432" 2025-12-02 11:42:10.232 UTC [50] LOG: database system was shut down at 2025-12-02 11:42:07 UTC 2025-12-02 11:42:10.239 UTC [47] LOG: database system is ready to accept connections done server started CREATE DATABASE

/usr/local/bin/docker-entrypoint.sh: ignoring /docker-entrypoint-initdb.d/*

waiting for server to shut down...2025-12-02 11:42:10.648 UTC [47] LOG: received fast shutdown request .2025-12-02 11:42:10.653 UTC [47] LOG: aborting any active transactions 2025-12-02 11:42:10.655 UTC [47] LOG: background worker "logical replication launcher" (PID 53) exited with exit code 1 2025-12-02 11:42:10.657 UTC [48] LOG: shutting down 2025-12-02 11:42:10.662 UTC [48] LOG: checkpoint starting: shutdown immediate 2025-12-02 11:42:11.085 UTC [48] LOG: checkpoint complete: wrote 926 buffers (5.7%); 0 WAL file(s) added, 0 removed, 0 recycled; write=0.166 s, sync=0.240 s, total=0.428 s; sync files=301, longest=0.144 s, average=0.001 s; distance=4273 kB, estimate=4273 kB; lsn=0/191F0D0, redo lsn=0/191F0D0 2025-12-02 11:42:11.092 UTC [47] LOG: database system is shut down done server stopped

PostgreSQL init process complete; ready for start up.

2025-12-02 11:42:11.206 UTC [1] LOG: starting PostgreSQL 16.11 (Debian 16.11-1.pgdg13+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 14.2.0-19) 14.2.0, 64-bit 2025-12-02 11:42:11.207 UTC [1] LOG: listening on IPv4 address "0.0.0.0", port 5432 2025-12-02 11:42:11.207 UTC [1] LOG: listening on IPv6 address "::", port 5432 2025-12-02 11:42:11.214 UTC [1] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432" 2025-12-02 11:42:11.225 UTC [63] LOG: database system was shut down at 2025-12-02 11:42:11 UTC 2025-12-02 11:42:11.239 UTC [1] LOG: database system is ready to accept connections 2025-12-02 11:47:11.277 UTC [61] LOG: checkpoint starting: time 2025-12-02 11:47:15.689 UTC [61] LOG: checkpoint complete: wrote 45 buffers (0.3%); 0 WAL file(s) added, 0 removed, 0 recycled; write=4.383 s, sync=0.011 s, total=4.413 s; sync files=12, longest=0.003 s, average=0.001 s; distance=260 kB, estimate=260 kB; lsn=0/19604D0, redo lsn=0/1960498 ^C2025-12-02 11:47:27.659 UTC [1] LOG: received fast shutdown request 2025-12-02 11:47:27.663 UTC [1] LOG: aborting any active transactions 2025-12-02 11:47:27.665 UTC [1] LOG: background worker "logical replication launcher" (PID 66) exited with exit code 1 2025-12-02 11:47:27.668 UTC [61] LOG: shutting down 2025-12-02 11:47:27.672 UTC [61] LOG: checkpoint starting: shutdown immediate 2025-12-02 11:47:27.684 UTC [61] LOG: checkpoint complete: wrote 0 buffers (0.0%); 0 WAL file(s) added, 0 removed, 0 recycled; write=0.001 s, sync=0.001 s, total=0.016 s; sync files=0, longest=0.000 s, average=0.000 s; distance=0 kB, estimate=234 kB; lsn=0/1960580, redo lsn=0/1960580 2025-12-02 11:47:27.689 UTC [1] LOG: database system is shut down ^C^Cadminov@ubuntuSVR1225DockerEngine:$ ^C adminov@ubuntuSVR1225DockerEngine:$ ^C adminov@ubuntuSVR1225DockerEngine:$ ^C adminov@ubuntuSVR1225DockerEngine:$ docker run -v db-data:var/lib/postgresql/data postgres:16 docker: Error response from daemon: invalid volume specification: 'db-data:var/lib/postgresql/data': invalid mount config for type "volume": invalid mount path: 'var/lib/postgresql/data' mount path must be absolute

Run 'docker run --help' for more information adminov@ubuntuSVR1225DockerEngine:$ docker volume create db-data db-data adminov@ubuntuSVR1225DockerEngine:$ docker run -v db-data:var/lib/postgresql/data postgres:16 docker: Error response from daemon: invalid volume specification: 'db-data:var/lib/postgresql/data': invalid mount config for type "volume": invalid mount path: 'var/lib/postgresql/data' mount path must be absolute

Run 'docker run --help' for more information adminov@ubuntuSVR1225DockerEngine:~$ docker run -v db-data:/var/lib/postgresql/data postgres:16

PostgreSQL Database directory appears to contain a database; Skipping initialization

2025-12-02 11:48:56.481 UTC [1] LOG: starting PostgreSQL 16.11 (Debian 16.11-1.pgdg13+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 14.2.0-19) 14.2.0, 64-bit 2025-12-02 11:48:56.481 UTC [1] LOG: listening on IPv4 address "0.0.0.0", port 5432 2025-12-02 11:48:56.481 UTC [1] LOG: listening on IPv6 address "::", port 5432 2025-12-02 11:48:56.488 UTC [1] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432" 2025-12-02 11:48:56.498 UTC [29] LOG: database system was shut down at 2025-12-02 11:47:27 UTC 2025-12-02 11:48:56.507 UTC [1] LOG: database system is ready to accept connections ^C2025-12-02 11:49:01.696 UTC [1] LOG: received fast shutdown request 2025-12-02 11:49:01.700 UTC [1] LOG: aborting any active transactions 2025-12-02 11:49:01.702 UTC [1] LOG: background worker "logical replication launcher" (PID 32) exited with exit code 1 2025-12-02 11:49:01.703 UTC [27] LOG: shutting down 2025-12-02 11:49:01.708 UTC [27] LOG: checkpoint starting: shutdown immediate 2025-12-02 11:49:01.741 UTC [27] LOG: checkpoint complete: wrote 3 buffers (0.0%); 0 WAL file(s) added, 0 removed, 0 recycled; write=0.015 s, sync=0.003 s, total=0.038 s; sync files=2, longest=0.002 s, average=0.002 s; distance=0 kB, estimate=0 kB; lsn=0/19605F8, redo lsn=0/19605F8 2025-12-02 11:49:01.746 UTC [1] LOG: database system is shut down adminov@ubuntuSVR1225DockerEngine:$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d220174fdd44 redis:3.2 "docker-entrypoint.s…" About an hour ago Up About an hour 6379/tcp redis.3.13a45cm7fmmhq6scy8s8au7l4 7e46292bbce2 nginx:latest "/docker-entrypoint.…" About an hour ago Up About an hour 80/tcp vote.2.gfeu6gbyvemfk8asy55n6imeh adminov@ubuntuSVR1225DockerEngine:$ docker container ls CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d220174fdd44 redis:3.2 "docker-entrypoint.s…" About an hour ago Up About an hour 6379/tcp redis.3.13a45cm7fmmhq6scy8s8au7l4 7e46292bbce2 nginx:latest "/docker-entrypoint.…" About an hour ago Up About an hour 80/tcp vote.2.gfeu6gbyvemfk8asy55n6imeh adminov@ubuntuSVR1225DockerEngine:$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d220174fdd44 redis:3.2 "docker-entrypoint.s…" About an hour ago Up About an hour 6379/tcp redis.3.13a45cm7fmmhq6scy8s8au7l4 7e46292bbce2 nginx:latest "/docker-entrypoint.…" About an hour ago Up About an hour 80/tcp vote.2.gfeu6gbyvemfk8asy55n6imeh adminov@ubuntuSVR1225DockerEngine:$ docker ls docker: unknown command: docker ls

Run 'docker --help' for more information adminov@ubuntuSVR1225DockerEngine:$ docker container ls CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d220174fdd44 redis:3.2 "docker-entrypoint.s…" About an hour ago Up About an hour 6379/tcp redis.3.13a45cm7fmmhq6scy8s8au7l4 7e46292bbce2 nginx:latest "/docker-entrypoint.…" About an hour ago Up About an hour 80/tcp vote.2.gfeu6gbyvemfk8asy55n6imeh adminov@ubuntuSVR1225DockerEngine:$ docker run -d -v db-data:/var/lib/postgresql/data postgres:16 2ec44f601ddd9e775b748a30bc66e43a04bb4a466c662916e9d211b3ddf4b0be adminov@ubuntuSVR1225DockerEngine:$ docker container ls CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 2ec44f601ddd postgres:16 "docker-entrypoint.s…" 3 seconds ago Up 2 seconds 5432/tcp clever_mclaren d220174fdd44 redis:3.2 "docker-entrypoint.s…" About an hour ago Up About an hour 6379/tcp redis.3.13a45cm7fmmhq6scy8s8au7l4 7e46292bbce2 nginx:latest "/docker-entrypoint.…" About an hour ago Up About an hour 80/tcp vote.2.gfeu6gbyvemfk8asy55n6imeh adminov@ubuntuSVR1225DockerEngine:$ adminov@ubuntuSVR1225DockerEngine:~$

Feel free to create issues or PRs if you find a problem with examples in this repository!