Tag: docker-compose.yml

How I Solved: Cannot connect to the Docker daemon at tcp://dind:2375. Is the docker daemon running?

OK, tl;dr, this is not a true fix. However, it works. Or worked for me.

The issue I have been facing, the one that has cost me my entire Saturday morning, is this:

➜  gitlab-ci docker-compose up 
Creating network "gitlab-ci_default" with the default driver
Creating gitlab-ci_runner_1_28ccd2f6e08d          ... done
Creating gitlab-ci_register-runner_1_6ddb7e90a9d3 ... done
Creating gitlab-ci_dind_1_bb210df194a2            ... done
Attaching to gitlab-ci_runner_1_3cb60d519ae8, gitlab-ci_register-runner_1_941db09830b5, gitlab-ci_dind_1_a0ef0b8a29e4
runner_1_3cb60d519ae8 | Runtime platform                                    arch=amd64 os=linux pid=7 revision=61e7606f version=14.1.0~beta.182.g61e7606f
runner_1_3cb60d519ae8 | Starting multi-runner from /etc/gitlab-runner/config.toml...  builds=0
runner_1_3cb60d519ae8 | Running in system-mode.                            
runner_1_3cb60d519ae8 |                                                    
runner_1_3cb60d519ae8 | Configuration loaded                                builds=0
runner_1_3cb60d519ae8 | listen_address not defined, metrics & debug endpoints disabled  builds=0
runner_1_3cb60d519ae8 | [session_server].listen_address not defined, session endpoints disabled  builds=0
register-runner_1_941db09830b5 | Runtime platform                                    arch=amd64 os=linux pid=7 revision=61e7606f version=14.1.0~beta.182.g61e7606f
dind_1_a0ef0b8a29e4 | Generating RSA private key, 4096 bit long modulus (2 primes)
register-runner_1_941db09830b5 | Running in system-mode.                            
register-runner_1_941db09830b5 |                                                    
register-runner_1_941db09830b5 | Registering runner... succeeded                     runner=cjX3zQG_
register-runner_1_941db09830b5 | Runner registered successfully. Feel free to start it, but if it's running already the config should be automatically reloaded! 
gitlab-ci_register-runner_1_941db09830b5 exited with code 0
dind_1_a0ef0b8a29e4 | .............................++++
dind_1_a0ef0b8a29e4 | ...........................................................................................................................................................++++
dind_1_a0ef0b8a29e4 | e is 65537 (0x010001)
dind_1_a0ef0b8a29e4 | Generating RSA private key, 4096 bit long modulus (2 primes)
runner_1_3cb60d519ae8 | Configuration loaded                                builds=0
dind_1_a0ef0b8a29e4 | .......++++
dind_1_a0ef0b8a29e4 | .............++++
dind_1_a0ef0b8a29e4 | e is 65537 (0x010001)
dind_1_a0ef0b8a29e4 | Signature ok
dind_1_a0ef0b8a29e4 | subject=CN = docker:dind server
dind_1_a0ef0b8a29e4 | Getting CA Private Key
dind_1_a0ef0b8a29e4 | /certs/server/cert.pem: OK
dind_1_a0ef0b8a29e4 | Generating RSA private key, 4096 bit long modulus (2 primes)
dind_1_a0ef0b8a29e4 | ................................................................++++
dind_1_a0ef0b8a29e4 | ...................................................................................................................++++
dind_1_a0ef0b8a29e4 | e is 65537 (0x010001)
dind_1_a0ef0b8a29e4 | Signature ok
dind_1_a0ef0b8a29e4 | subject=CN = docker:dind client
dind_1_a0ef0b8a29e4 | Getting CA Private Key
dind_1_a0ef0b8a29e4 | /certs/client/cert.pem: OK
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.193084271Z" level=info msg="Starting up"
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.194256426Z" level=warning msg="could not change group /var/run/docker.sock to docker: group docker not found"
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.198038066Z" level=info msg="libcontainerd: started new containerd process" pid=53
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.198088131Z" level=info msg="parsed scheme: "unix"" module=grpc
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.198099583Z" level=info msg="scheme "unix" not registered, fallback to default scheme" module=grpc
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.198127773Z" level=info msg="ccResolverWrapper: sending update to cc: {[{unix:///var/run/docker/containerd/containerd.sock  <nil> 0 <nil>}] <nil> <nil>}" module=grpc
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.198154133Z" level=info msg="ClientConn switching balancer to "pick_first"" module=grpc
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.211367108Z" level=info msg="starting containerd" revision=d71fcd7d8303cbf684402823e425e9dd2e99285d version=v1.4.6
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.236199982Z" level=info msg="loading plugin "io.containerd.content.v1.content"..." type=io.containerd.content.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.236321650Z" level=info msg="loading plugin "io.containerd.snapshotter.v1.aufs"..." type=io.containerd.snapshotter.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.240984040Z" level=info msg="loading plugin "io.containerd.snapshotter.v1.btrfs"..." type=io.containerd.snapshotter.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.241236268Z" level=info msg="skip loading plugin "io.containerd.snapshotter.v1.btrfs"..." error="path /var/lib/docker/containerd/daemon/io.containerd.snapshotter.v1.btrfs (ext4) must be a btrfs filesystem to be used with the btrfs snapshotter: skip plugin" type=io.containerd.snapshotter.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.241270029Z" level=info msg="loading plugin "io.containerd.snapshotter.v1.devmapper"..." type=io.containerd.snapshotter.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.241295950Z" level=warning msg="failed to load plugin io.containerd.snapshotter.v1.devmapper" error="devmapper not configured"
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.241311248Z" level=info msg="loading plugin "io.containerd.snapshotter.v1.native"..." type=io.containerd.snapshotter.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.241375982Z" level=info msg="loading plugin "io.containerd.snapshotter.v1.overlayfs"..." type=io.containerd.snapshotter.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.241537098Z" level=info msg="loading plugin "io.containerd.snapshotter.v1.zfs"..." type=io.containerd.snapshotter.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.241730231Z" level=info msg="skip loading plugin "io.containerd.snapshotter.v1.zfs"..." error="path /var/lib/docker/containerd/daemon/io.containerd.snapshotter.v1.zfs must be a zfs filesystem to be used with the zfs snapshotter: skip plugin" type=io.containerd.snapshotter.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.241748382Z" level=info msg="loading plugin "io.containerd.metadata.v1.bolt"..." type=io.containerd.metadata.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.241783028Z" level=warning msg="could not use snapshotter devmapper in metadata plugin" error="devmapper not configured"
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.241794800Z" level=info msg="metadata content store policy set" policy=shared
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.262730870Z" level=info msg="loading plugin "io.containerd.differ.v1.walking"..." type=io.containerd.differ.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.262764458Z" level=info msg="loading plugin "io.containerd.gc.v1.scheduler"..." type=io.containerd.gc.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.262808206Z" level=info msg="loading plugin "io.containerd.service.v1.introspection-service"..." type=io.containerd.service.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.262843956Z" level=info msg="loading plugin "io.containerd.service.v1.containers-service"..." type=io.containerd.service.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.262862664Z" level=info msg="loading plugin "io.containerd.service.v1.content-service"..." type=io.containerd.service.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.262875776Z" level=info msg="loading plugin "io.containerd.service.v1.diff-service"..." type=io.containerd.service.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.262889612Z" level=info msg="loading plugin "io.containerd.service.v1.images-service"..." type=io.containerd.service.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.262902664Z" level=info msg="loading plugin "io.containerd.service.v1.leases-service"..." type=io.containerd.service.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.262923290Z" level=info msg="loading plugin "io.containerd.service.v1.namespaces-service"..." type=io.containerd.service.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.262946006Z" level=info msg="loading plugin "io.containerd.service.v1.snapshots-service"..." type=io.containerd.service.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.262959263Z" level=info msg="loading plugin "io.containerd.runtime.v1.linux"..." type=io.containerd.runtime.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263113401Z" level=info msg="loading plugin "io.containerd.runtime.v2.task"..." type=io.containerd.runtime.v2
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263225410Z" level=info msg="loading plugin "io.containerd.monitor.v1.cgroups"..." type=io.containerd.monitor.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263552551Z" level=info msg="loading plugin "io.containerd.service.v1.tasks-service"..." type=io.containerd.service.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263577871Z" level=info msg="loading plugin "io.containerd.internal.v1.restart"..." type=io.containerd.internal.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263616499Z" level=info msg="loading plugin "io.containerd.grpc.v1.containers"..." type=io.containerd.grpc.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263632647Z" level=info msg="loading plugin "io.containerd.grpc.v1.content"..." type=io.containerd.grpc.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263648459Z" level=info msg="loading plugin "io.containerd.grpc.v1.diff"..." type=io.containerd.grpc.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263661513Z" level=info msg="loading plugin "io.containerd.grpc.v1.events"..." type=io.containerd.grpc.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263674151Z" level=info msg="loading plugin "io.containerd.grpc.v1.healthcheck"..." type=io.containerd.grpc.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263687079Z" level=info msg="loading plugin "io.containerd.grpc.v1.images"..." type=io.containerd.grpc.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263699853Z" level=info msg="loading plugin "io.containerd.grpc.v1.leases"..." type=io.containerd.grpc.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263789801Z" level=info msg="loading plugin "io.containerd.grpc.v1.namespaces"..." type=io.containerd.grpc.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263807278Z" level=info msg="loading plugin "io.containerd.internal.v1.opt"..." type=io.containerd.internal.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263947799Z" level=info msg="loading plugin "io.containerd.grpc.v1.snapshots"..." type=io.containerd.grpc.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263971592Z" level=info msg="loading plugin "io.containerd.grpc.v1.tasks"..." type=io.containerd.grpc.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.263987446Z" level=info msg="loading plugin "io.containerd.grpc.v1.version"..." type=io.containerd.grpc.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.264001179Z" level=info msg="loading plugin "io.containerd.grpc.v1.introspection"..." type=io.containerd.grpc.v1
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.264194211Z" level=info msg=serving... address=/var/run/docker/containerd/containerd-debug.sock
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.264252887Z" level=info msg=serving... address=/var/run/docker/containerd/containerd.sock.ttrpc
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.264299356Z" level=info msg=serving... address=/var/run/docker/containerd/containerd.sock
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.264314178Z" level=info msg="containerd successfully booted in 0.053975s"
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.271530892Z" level=info msg="parsed scheme: "unix"" module=grpc
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.271565662Z" level=info msg="scheme "unix" not registered, fallback to default scheme" module=grpc
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.271592175Z" level=info msg="ccResolverWrapper: sending update to cc: {[{unix:///var/run/docker/containerd/containerd.sock  <nil> 0 <nil>}] <nil> <nil>}" module=grpc
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.271613087Z" level=info msg="ClientConn switching balancer to "pick_first"" module=grpc
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.272302289Z" level=info msg="parsed scheme: "unix"" module=grpc
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.272321745Z" level=info msg="scheme "unix" not registered, fallback to default scheme" module=grpc
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.272351355Z" level=info msg="ccResolverWrapper: sending update to cc: {[{unix:///var/run/docker/containerd/containerd.sock  <nil> 0 <nil>}] <nil> <nil>}" module=grpc
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.272365620Z" level=info msg="ClientConn switching balancer to "pick_first"" module=grpc
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.342826242Z" level=warning msg="Your kernel does not support swap memory limit"
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.342846686Z" level=warning msg="Your kernel does not support CPU realtime scheduler"
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.342999134Z" level=info msg="Loading containers: start."
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.417804617Z" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0/16. Daemon option --bip can be used to set a preferred IP address"
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.465223597Z" level=info msg="Loading containers: done."
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.494192010Z" level=info msg="Docker daemon" commit=b0f5bc3 graphdriver(s)=overlay2 version=20.10.7
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.494297708Z" level=info msg="Daemon has completed initialization"
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.559800797Z" level=info msg="API listen on /var/run/docker.sock"
dind_1_a0ef0b8a29e4 | time="2021-06-19T09:44:43.565866502Z" level=info msg="API listen on [::]:2376"
runner_1_3cb60d519ae8 | Checking for jobs... received                       job=870 repo_url=https://example.com/myrepo/myproject.git runner=A6qDsS-H
runner_1_3cb60d519ae8 | ERROR: Failed to remove network for build           error=networksManager is undefined job=870 network= project=90 runner=A6qDsS-H
runner_1_3cb60d519ae8 | WARNING: Preparation failed: Cannot connect to the Docker daemon at tcp://dind:2375. Is the docker daemon running? (docker.go:865:0s)  job=870 project=90 runner=A6qDsS-H
runner_1_3cb60d519ae8 | Will be retried in 3s ...                           job=870 project=90 runner=A6qDsS-H
runner_1_3cb60d519ae8 | ERROR: Failed to remove network for build           error=networksManager is undefined job=870 network= project=90 runner=A6qDsS-H
runner_1_3cb60d519ae8 | WARNING: Preparation failed: Cannot connect to the Docker daemon at tcp://dind:2375. Is the docker daemon running? (docker.go:865:0s)  job=870 project=90 runner=A6qDsS-H
runner_1_3cb60d519ae8 | Will be retried in 3s ...                           job=870 project=90 runner=A6qDsS-H
runner_1_3cb60d519ae8 | ERROR: Failed to remove network for build           error=networksManager is undefined job=870 network= project=90 runner=A6qDsS-H
runner_1_3cb60d519ae8 | WARNING: Preparation failed: Cannot connect to the Docker daemon at tcp://dind:2375. Is the docker daemon running? (docker.go:865:0s)  job=870 project=90 runner=A6qDsS-H
runner_1_3cb60d519ae8 | Will be retried in 3s ...                           job=870 project=90 runner=A6qDsS-H
runner_1_3cb60d519ae8 | ERROR: Job failed (system failure): Cannot connect to the Docker daemon at tcp://dind:2375. Is the docker daemon running? (docker.go:865:0s)  duration_s=9.004197071 job=870 project=90 runner=A6qDsS-H
runner_1_3cb60d519ae8 | WARNING: Failed to process runner                   builds=0 error=Cannot connect to the Docker daemon at tcp://dind:2375. Is the docker daemon running? (docker.go:865:0s) executor=docker runner=A6qDsS-H

The critical lines being:

WARNING: Preparation failed: Cannot connect to the Docker daemon at tcp://dind:2375. Is the docker daemon running? (docker.go:865:0s)

This setup is for GitLab CI, where I run GitLab Runner through docker compose.

Here’s my docker-compose.yaml config, for what it’s worth:

version: '3'

services:

  dind:
    restart: always
    privileged: true
    volumes:
    - /var/lib/docker
    image: docker:17.09.0-ce-dind 
    entrypoint: ["dockerd-entrypoint.sh", "--tls=false", "--storage-driver=overlay2"]

  runner:
    restart: always
    image: gitlab/gitlab-runner:alpine
    volumes:
    - ./gitlab/runner:/etc/gitlab-runner:Z
    - ./gitlab/runner/builds:/builds
    environment:
    - DOCKER_HOST=tcp://dind:2375
      
  register-runner:
    restart: 'no'
    image: gitlab/gitlab-runner:alpine
    volumes:
    - ./gitlab/runner:/etc/gitlab-runner:Z
    command:
    - register
    - --non-interactive
    - --locked=false
    - --name=mybox
    - --executor=docker
    - --docker-image=docker:19.03.12
    - --docker-privileged
    environment:
    - CI_SERVER_URL=http://example.com/
    - REGISTRATION_TOKEN=my-token-here

(careful, this won’t copy paste due to WP funking up the encoding)

Note, the docker image version used by dind is the most important part here. The docker image version used by register-runner doesn’t seem to matter.

Prior to this I tried the very latest docker image, then docker:19.03.12 as per the official GitLab docs (at the time of writing), and then fortunately, I had my ancient configs which gave me the heads up to try a much older version of Docker.

So it seems using the older docker version ‘fixes’ this. I don’t know why – and I don’t have time (nor really, the inclination) to investigate. If you’re looking for a quick fix, hopefully this works for you. And if you do have the proper fix, please let me know via a comment.

How I am using Docker with Symfony, nginx, and MySQL

Behind the scenes this week I have been continuing my work on the next major iteration of the CodeReviewVideos website.

I’ve split the site into two parts:

  • A Symfony 3 powered JSON API for the back-end.
  • React / Redux / Redux Saga for the front-end

It’s a stack that I really enjoy working with, and is all stuff I’ve covered here on the site before.

Progress has gone fairly well this week. As a developer I always expect to be further ahead than I actually am. Partly this is impatience, and partly because I am still not so good at estimating 🙂

By next week’s newsletter I am hoping to be able to share access to the “beta” (for want of a better word) with existing site subscribers.

Become An Instructor

I really want to make CodeReviewVideos as useful to you as possible.

There are likely dozens of topics you’d like to see covered that either I have not yet had chance to record videos for, or do not have any experience in.

Topics like Angular 2/4, Vue, WordPress, Magento… all the things that we as developers have to work with in our real-world, day-to-day jobs.

If you have ever wanted to start recording screencasts / tutorials then this may well be the perfect opportunity to do so, and earn some extra recurring income in the process.

If you’d like to know more then please send an email to chris@codereviewvideos.com.

Video Update

This week saw three new videos added to the site.

#1. How to add a Flash Message on Successful, or Failed Login

I got asked this question:

how can I “$this->addFlash” for login? Because now its working only with registration. How can I make it work with login? Check if signing in was successful/not successful?

There is a solution built into Symfony’s security bundle (think: Login form configuration) to make this fairly easy to accomplish.

There is just one small problem: lack of documentation / example.

I’m hoping to correct that with this video. Before going too much further, you may be wondering:

What are Flash Messages?

Flash messages in Symfony are simply one time messages – notifications, by another name – that are stored in the session and are removed as soon as they have been shown once.

If still unsure, I have a video called the Beginners Guide to Symfony Flash Messages. It’s free to watch.

Symfony 3.3 comes with some improvements to the way Flash messages work.

We cover how to add a Flash Message using the success_handler and failure_handler services. The tricky part is that these two services must behave a certain way, and this video covers one approach to this problem.

I’m always open to answering questions like this, so if you have any that you feel would be best answered by video then do please send them in.

#2.  [Demo] – Docker with Symfony, nginx, and MySQL

Docker.

It’s popular.

It’s good for the CV.

It’s also complicated.

In this video we take a look at a Dockerised environment in which the latest version of Symfony 3, an nginx webserver, and a MySQL database can be “spun-up” in next to no time.

The idea here is to take a look at what’s possible, rather than me saying: Hey, this is all you need to know.

I’ve planned out the Docker series and it’s going to be a few shorter series that can be watched independently, or all together.

There are a bunch of topics in Docker that you can initially skip over. Only as and when you have a need for either a more complex setup, or want to satisfy your curiosity do you need to delve any deeper.

This is good, in my opinion, as Docker itself is both broad and deep, and if we covered all the fundamentals upfront then you may be sound asleep by the end of the first few videos.

Because seeing code is fun, here’s the docker-compose.yml file that this video covers:

# docker-compose.yml

version: '2'

services:

    db:
        image: mysql:5.7.17
        env_file:
          - ./.env
        volumes:
          - "./volumes/mysql/dev:/var/lib/mysql"
        networks:
          crv_dev_network:
            aliases:
              - mysql

    nginx:
        image: codereviewvideos/nginx.dev
        ports:
          - "81:80"
        restart: always
        volumes:
          - "./volumes/nginx/logs:/var/log/nginx/"
        volumes_from:
            - php
        networks:
          crv_dev_network:
            aliases:
              - nginx

    php:
        image: codereviewvideos/www.dev
        restart: always
        env_file:
          - ./.env
        volumes:
          - "./volumes/php/app/cache:/var/www/dev/app/cache/:rw"
          - "./volumes/php/app/logs:/var/www/dev/app/logs/:rw"
          - "./volumes/.composer:/var/www/.composer"
          - "./app:/var/www/dev"
        networks:
          crv_dev_network:
            aliases:
              - php

networks:
  crv_dev_network:
    driver: bridge

You can watch the video here, and then hit the Repo over on GitHub.

We will cover everything in this repo piece by piece, building more than just a Symfony stack in the process.

#3. Linux Permissions 101

Oh my, this sounds dull.

Yes, I hear you.

There are parts of Development that sound sexy and fun (e.g. Docker, the latest JS framework, real-time mobile apps, etc), and then there are the dry and boring sounding topics that unfortunately, you really need to know.

I realise permissions aren’t much fun.

That’s why I have compressed the essential knowledge down into a 4 minute long video.

If you have ever seen something like this:

➜  ~ ls -la Development/docker/nginx

total 24
drwxrwxr-x  4 www-data www-data 4096 Apr  3 19:43 .
drwxrwxr-x 74 chris    chris    4096 Aug 17 20:15 ..
drwxrwxr-x  2 www-data www-data 4096 Apr  3 19:37 conf.d
-rwxrwxr-x  1 www-data www-data  137 Apr 18 20:51 Dockerfile
-rwxrwxr-x  1 www-data www-data   13 Apr  3 19:42 .dockerignore
drwxrwxr-x  8 www-data www-data 4096 Aug 19 12:05 .git

And you have wondered just what the heck most of this means then this video will see you right.

To work with Docker it is essential you understand just a small amount of this output. Most every problem I have had with Docker has been related to permissions. Trust me on this, if you want to use Docker then you need to know this stuff.

And the good news is that it’s really not that bad. And it’s useful beyond working with Docker too. Win win!

Until next week, have a great weekend, and happy coding.

Chris