Full CI pipeline project based on Gitlab & Gitlab CI running Docker, completely automated setup by Vagrant & Ansible, providing Let´s Encrypt certificates for private Servers, multiple Gitlab-Runners and the Gitlab Container Registry
This project is somehow based on the thought of https://github.com/marcelbirkner/docker-ci-tool-stack. But since the good old days of Jenkins times changed "a bit". Maybe today Jenkins incl. 2.x/Pipeline-plugin isn´t the way to go - or it´s just the way, if you really want to have a hard time. Why? Here are some points:
"Jenkins servers become snowflakes"
"Jenkins 2.0 tries to address this by promoting a Pipeline plugin (plus another plugin to visualize it), but it kind of misses the point."
https://content.pivotal.io/blog/comparing-bosh-ansible-chef-part-1
I heard from so many colleagues:
"Hey Jonas you Jenkins fanboy. Have a look on all those cool new CI servers like Concourse, Circle CI oder even Gitlab CI! We don´t know, why you´re messing around with Jenkins..." .
Well, ok then. Let´s give it a try. And because of all this here:
https://www.slant.co/versus/2482/10699/~gitlab-ci_vs_concourse-ci
https://www.reddit.com/r/devops/comments/6cuj0s/concourse_jenkins_ci/
https://concourse-ci.org/concourse-vs.html
Therefore I wanted to have a deeper look into Gitlab.
Today Gitlab not only offers a alternative to Bitbucket Server or GitHub Enterprise, they also offer an alternate CI-Implementation:
Source: https://docs.gitlab.com/ce/ci/README.html
Back in 2015 Marcel already fired up everything with Docker Compose (as I mentioned https://github.com/marcelbirkner/docker-ci-tool-stack). It is also easy to fire up Gitlab with Docker Compose locally, just fire up inside this repo:
docker-compose up -d
BUT: There are some prerequisites needed for Gitlab CI on your Machine: Docker & Compose have to be installed, and you need to manually install and configure Gitlab Runners - amongst some other things.
What I really love is to achieve comprehensible solutions that are usable as is in your project. And you won´t run your Companie´s Gitlab on your local machine, would you?! You will always try to get a server and install Gitlab there.
To achieve a fully comprehensible setup here, we some DevOps tools FTW:
- Ansible: This shiny pice will contain ALL steps necessary to provision a Gitlab server with everything needed. It´s also a great documentation what´s needed to setup a Gitlab server.
- Vagrant: To just fire up a server locally that is based on a certain OS - because that´s needed to craft a Ansible playbook. But this is just for demonstration purposes - you can switch over to your Gitlab server by just editing the hostsfile and adding
[yourcompanygitlab]together with it´s IP.
Be sure to have the following tools installed: Ansible, VirtualBox & Vagrant. On a Mac this is simple:
brew install ansible
brew cask install virtualbox
brew cask install vagrant
Our setup uses the vagrant-dns Plugin. Just install it with:
vagrant plugin install vagrant-dns
Now be sure to add your domain name into the Vagrantfile. As I own the domain jonashackt.io, I added the following:
config.vm.hostname = "jonashackt"
config.dns.tld = "io"
That´s all, we´re ready to fire up our server with:
vagrant up
If the server is up and running (this may take a while when doing it for the first time), we can execute Ansible.
Let´s do a connection check first:
ansible gitlab-ci-stack -i hostsfile -m ping
If this gave a SUCCESS, we can move on to really execute our Ansible playbooks.
All the Installation process is based upon the "Omnibus GitLab installation" (NOT the from source option)
To just execute the playbook and install everything needed to have a fully functional Gitlab-Instance, you only need to run the following Ansible Playbook.
Just be sure to configure your Domain name inside prepare-gitlab.yml:
vars:
gitlab_domain: "gitlab.jonashackt.io"
and provide providername, providerusername & providertoken for your DNS Providers´s API in --extra-vars (and maybe whitelist your current Internet IP):
ansible-playbook -i hostsfile prepare-gitlab.yml --extra-vars "providername=yourProviderNameHere providerusername=yourUserNameHere providertoken=yourProviderTokenHere"
Only, if you don´t use Vagrant or an only internally accessible Server, you can ignore the extra-vars - Gitlab will handle Let´s Encrypt for you then:
ansible-playbook -i hostsfile prepare-gitlab.yml
If you want to know more about the installation Process, just read on:
The prepare-docker-ubuntu.yml just walks through the standard Docker docs guide on how to install Docker on Ubuntu. If you use another Distro, you can simply change modules etc. to match your Linux.
The only thing special here is how we install Docker Compose, which is described in the Docs with that unappealing way of always using a hard-coded version in the curl. Therefore the hint:
Use the latest Compose release number in the download command.
But there´s a much nicer way, because Python PIP has the current package ready for us:
- name: Install pip
apt:
name: python3-pip
state: latest
- name: Install Docker Compose
pip:
name: docker-compose
Now we don´t need to mess with maintaining the Docker Compose version number & the upgrade process any more!
We don´t want to access Gitlab via a http://locahost:30080 call - instead we want to have something like http://docker.gitlab.ci!
To enable that on the Host machine, we need the vagrant-dns Plugin. Just install it with:
vagrant plugin install vagrant-dns
Now we configure a domain name such as jonashackt and a TLD like io in our Vagrantfile:
config.vm.hostname = "jonashackt"
config.dns.tld = "io"
Now we need to register the vagrant-dns Server with the TLD io as a DNS resolver:
vagrant dns --install
Now check with scutil --dns (on a Mac), if the resolver is part of your DNS configuration:
...
resolver #10
domain : io
nameserver[0] : 127.0.0.1
port : 5300
flags : Request A records, Request AAAA records
reach : 0x00030002 (Reachable,Local Address,Directly Reachable Address)
...
This looks good! Now after the usual vagrant up, try if you´re able to reach our Vagrant Box using our defined domain by typing e.g. dscacheutil -q host -a name gitlab.jonashackt.io:
$:gitlab-ci-stack jonashecht$ dscacheutil -q host -a name gitlab.jonashackt.io
name: gitlab.jonashackt.io
ip_address: 172.16.2.15
But as we want to have the nice docker.gitlab.ci also available inside our Vagrant Box and the vagrant-dns Plugin doesn´t support propagating the host´s DNS resolver to the Vagrant Boxes, we have a problem.
But luckily we have VirtualBox as a virtualization provider for Vagrant, which supports the propagation of the host´s DNS resolver to the guest machines. All we have to do, is to use this suggestion on serverfault:, which will 'Using the host's resolver as a DNS proxy in NAT mode':
# Forward DNS resolver from host (vagrant dns) to box
virtualbox.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]
After we configured that, we can do our well-known vagrant up.
Now we should be able to ping gitlab.jonashackt.io.
https://docs.gitlab.com/omnibus/settings/nginx.html#enable-https
From 10.7 we will automatically use Let's Encrypt certificates if the external_url specifies https), the certificate files are absent, and the embedded nginx will be used to terminate ssl connections.
If you have an externally accessable server and provision it with these Ansible scripts, you don´t have to worry about the process of obtaining Let´s Encrypt certificates and configuring them for Gitlab. Everything is just done for you by the Gitlab Installation process.
BUT: The problem is our local setup here: Let´s Encrypt wont be able to validate the certificate for our domain, since it´s just a local DNS installation.
That sounds like we´re in need of a different way. Because if we just use our domain with https like https://gitlab.jonashackt.io/, our Browser will complain:
and a git push will result into the following problem:
$ git push
fatal: unable to access 'https://gitlab.jonashackt.io/root/yourRepoNameHere/': SSL certificate problem: self signed certificate
Although Let´s Encrypt was designed to be used with public accessable websites, there are ways to create these Certificates for non-public servers also. All you need to have is a regularly registered domain - which maybe sounds like a big issue, but isn´t really a problem! (don´t try to use already registered ones, this won´t work!)
If you don´t mind about the tld, choose something like yourDomainName.yxz or yourDomainName.online, which are available from 1$/year. Just be sure to pick one from this provider list.
YOU NEED API ACCESS TO PROCEED!: What all the blog posts only tell you at the end: Besides your regularly registered/purchased domain you´ll need API-access to your provider, which often isn´t included in the standard price of your domain! I choose https://www.namecheap.com/ and to use the namecheap api, you´ll need to upgrade your balance to 50$. And you often also need to whitelist the IP your approaching the DNS provider API from - in our case, use a tool like http://www.whatsmyip.org/ to get the IP and add it to your DNS providers API access IP whitelist (just be sure to double check this IP before you call the playbook!)
There has been done some great work in the field of generating Let´s Encrypt certificates for private servers (see https://blog.thesparktree.com/generating-intranet-and-private-network-ssl)
The playbook obtain-letsencrypt-certs-dehydrated-lexicon.yml just automates all the steps described in the mentioned post. It uses dehydrated as an alternative Let´s Encrypt client togehter with lexicon, which is standardises the way how to manipulate DNS records via their API on multiple DNS providers. We install both tools with Ansible:
# This playbook should work for servers, that aren´t accessable from the internet (like our local Vagrant setup here)
# Be sure to use a real/purchased domain!
# The playbook automates all the steps mentioned here https://blog.thesparktree.com/generating-intranet-and-private-network-ssl
- name: Update apt
apt:
update_cache: yes
- name: Install openssl, curl, sed, grep, mktemp, git
apt:
name:
- openssl
- curl
- sed
- grep
- mktemp
- git
state: latest
# install this neat tool https://github.com/lukas2511/dehydrated
- name: Install dehydrated
git:
repo: 'https://github.com/lukas2511/dehydrated.git'
dest: /srv/dehydrated
- name: Make dehydrated executable
file:
path: /srv/dehydrated/dehydrated
mode: "+x"
- name: Specify our internal domain
shell: "echo '{{ gitlab_domain }}' > /srv/dehydrated/domains.txt"
- name: Install build-essential, python-dev, libffi-dev, python3-pip
apt:
name:
- build-essential
- python-dev
- libffi-dev
- libssl-dev
- python3-pip
state: latest
- name: Install requests[security]
pip:
name: "requests[security]"
# install this neat tool https://github.com/AnalogJ/lexicon
- name: Install dns-lexicon with correct provider (dns-lexicon[providernamehere])
pip:
name: "dns-lexicon[{{providername|lower}}]"
As we don´t have a publicly accessable server, we need to use dns-01 challenges instead of the Let´s Encrypt standard http-01. Therefor dehydrated needs a hook file to work with dns-01. lexicon has such a file for us /examples/dehydrated.default.sh and we copy it simply inside our playbook:
- name: Configure lexicon with Dehydrated hook for dns-01 challenge
get_url:
url: https://raw.githubusercontent.com/AnalogJ/lexicon/master/examples/dehydrated.default.sh
dest: /srv/dehydrated/dehydrated.default.sh
mode: "+x"
At that point we need to use some private information about your DNS provider - because remember, the whole process could only be done, if you have access to a real domain. In order to grant lexicon access to your DNS provider´s API, we set some environment variables and then execute dehydrated:
# be sure to check https://github.com/AnalogJ/lexicon#providers
# the env variables are constructed with LEXICON_{DNS Provider Name}_{Auth Type}
# since, the dynamic key name like LEXICON_{DNS Provider Name}_{Auth Type}, we can´t use the standard approach (http://docs.ansible.com/ansible/latest/user_guide/playbooks_environment.html)
# because our Environment variable key names are dynamic based on the Provider name. Therefor we use the hint in https://stackoverflow.com/a/44570290/4964553
# and construct the variables with "{'dynamic environment variable key name inkl. {{ vars }}':'{{ dynamic environment variable value}}'}"
# If everything went fine, this should place the new Let´s Encrypt Certificates into /srv/dehydrated/certs/{{ gitlab_domain }}
- name: Generate Certificates
shell: "/srv/dehydrated/dehydrated --cron --hook /srv/dehydrated/dehydrated.default.sh --challenge dns-01 --accept-terms"
environment:
- PROVIDER: "{{providername|lower}}"
- "{'LEXICON_{{providername|upper}}_USERNAME':'{{providerusername}}'}"
- "{'LEXICON_{{providername|upper}}_TOKEN':'{{providertoken}}'}"
ignore_errors: true
As you can see, all environment variables are set with the help of Ansible´s --extra-vars CLI like this:
ansible-playbook -i hostsfile prepare-gitlab.yml --skip-tags "install_docker,install_gitlab,gitlab_runner" --extra-vars "providername=yourProviderNameHere providerusername=yourUserNameHere providertoken=yourProviderTokenHere"
Just change yourProviderNameHere, yourUserNameHere and yourProviderTokenHere accordingly!
Configure the "self-created" Let´s Encrypt certificates in Gitlab (it´s the same process for other certificates then Let´s Encrypt)
Please don´t get confused with this part of the docs: https://docs.gitlab.com/omnibus/settings/ssl.html#install-custom-certificate-authorities, since that´s only needed, if you want to install a custom certificate authority and not necessary for correctly created Let´s Encrypt certificates (since the Let´s Encrypt authority is already trusted!)
According to the docs there are 2 ways to configure HTTPS in Gitlab: The automatic Let´s Encrypt way, which we sadly can´t use in our scenario here, where our Vagrant Box isn´t publically accessible - and the way to manually configure HTTPS, the one we need to choose here.
Therefore we set the external_url via the Environment variable EXTERNAL_URL: "{{gitlab_url}}" at the Gitlab Omnibus installation process to contain an https, in our example here: https://gitlab.jonashackt.io (remember you need to own the domain or at least need access to the DNS provider for the Let´s Encrypt process for internal servers).
After that, Gitlab Omnibus installation will look for certificates named /etc/gitlab/ssl/gitlab.jonashackt.io.key & /etc/gitlab/ssl/gitlab.jonashackt.io.crt - note that both file names are derived from the domain name gitlab.jonashackt.io.
Everything needed is done by the letsencrypt.yml, it will just copy the generated certificates with the correct name to the correct location:
- name: Create Gitlab cert import folder /etc/gitlab/ssl for later Gitlab Installation usage
file:
path: /etc/gitlab/ssl
state: directory
when: success
- name: Copy certificate files to Gitlab cert import folder /etc/gitlab/ssl (see https://docs.gitlab.com/omnibus/settings/ssl.html#details-on-how-gitlab-and-ssl-work)
copy:
src: "{{ item.src }}"
dest: "{{ item.dest }}"
remote_src: yes
with_items:
- src: "/srv/dehydrated/certs/{{ gitlab_domain }}/fullchain.pem"
dest: "/etc/gitlab/ssl/{{ gitlab_domain }}.crt"
- src: "/srv/dehydrated/certs/{{ gitlab_domain }}/privkey.pem"
dest: "/etc/gitlab/ssl/{{ gitlab_domain }}.key"
when: success
Now you can use your Gitlab without cryptic error messages because of self-signed certificates:
The playbook install-gitlab.yml will walk through the standard Gitlab installation guide for Ubuntu - just automatically: https://about.gitlab.com/installation/#ubuntu (others are available also like CentOS:
- name: Update apt and autoremove
apt:
update_cache: yes
cache_valid_time: 3600
autoremove: yes
- name: Install curl, openssh-server, ca-certificates & postfix
apt:
name:
- curl
- openssh-server
- ca-certificates
- postfix
state: latest
- name: Add the GitLab package repository
shell: "curl https://packages.gitlab.com/install/repositories/gitlab/gitlab-ce/script.deb.sh | sudo bash"
- name: Update apt and autoremove
apt:
update_cache: yes
cache_valid_time: 3600
autoremove: yes
- name: Install Gitlab with Omnibus-Installer
apt:
name: gitlab-ce
state: latest
environment:
EXTERNAL_URL: "{{gitlab_url}}"
ignore_errors: true
register: gitlab_install_result
- name: Gitlab Omnibus is based on Chef and will give many insight, what it does in the background
debug:
msg:
- "The installation process said the following: "
- "{{gitlab_install_result.stdout_lines}}"
- name: Wait for Gitlab to start up
wait_for:
port: 443
delay: 10
sleep: 5
- name: Let´s check, if Gitlab is up and running
uri:
url: "{{gitlab_url}}"
https://docs.gitlab.com/ee/user/project/container_registry.html
Gitlab Container Registry domain configuration
If we just use our configured domain, we can follow the docs here: https://docs.gitlab.com/ee/administration/container_registry.html#configure-container-registry-under-an-existing-gitlab-domain
- name: Activate Container Registry in /etc/gitlab/gitlab.rb
lineinfile:
path: /etc/gitlab/gitlab.rb
line: " registry_external_url '{{ gitlab_registry_url }}'"
- name: Reconfigure Gitlab to activate Container Registry
shell: "gitlab-ctl reconfigure"
register: reconfigure_result
- name: Let´s see what Omnibus/Chef does
debug:
msg:
- "The reconfiguration process gave the following: "
- "{{reconfigure_result.stdout_lines}}"
The playbook configure-gitlab-registry.yml inserts the following needed config into the gitlab.rb: registry_external_url 'https://gitlab.jonashackt.io:4567' and this follows after a sudo gitlab-ctl reconfigure:
Ubuntu & Docker don´t know Let´s Encrypt so we need to copy the fullchain.pem instead of just the cert.pem!
The next problem was the following error while registering the gitlab-runners in letsencrypt.yml:
ERROR: Registering runner... failed
runner=gyy8axxP status=couldn't execute POST against https://gitlab.jonashackt.io/api/v4/runners: Post https://gitlab.jonashackt.io/api/v4/runners: x509: certificate signed by unknown authority
PANIC: Failed to register this runner. Perhaps you are having network problems
To avoid that for now, I added the --tls-ca-file option like so: --tls-ca-file=/etc/gitlab/ssl/gitlab.jonashackt.io.crt which is described here: https://gitlab.com/gitlab-org/gitlab-runner/issues/230
But, then the next problem occured inside the Pipeline at the first step, where we want to use the Gitlab Container Registry:
Error response from daemon: Get https://gitlab.jonashackt.io:5000/v2/: x509: certificate signed by unknown authority
ERROR: Job failed: exit status 1
Luckily this problem was already solved by https://github.com/bkcsfi in moby/moby#31602 (comment), where he states that the
I think you probably want to use fullchain.pem instead of cert.pem because neither docker (go lib) nor (ubuntu in my case) have LE root cert built in at this time
I have gitlab setup with LE certificate. Browser works fine, but docker fails to push to registry.
So all we have to do to tell the Gitlab Container Registry about our Let´s Encrypt certificates is to copy /srv/dehydrated/certs/{{ gitlab_domain }}/fullchain.pem instead of /srv/dehydrated/certs/{{ gitlab_domain }}/cert.pem to Gitlab certificates.
This configures also the Gitlab Container Registry, although it seems to be an configuration option for Gitlab itself only - just have a look into the docs:
If your TLS certificate is not in /etc/gitlab/ssl/gitlab.example.com.crt and key not in /etc/gitlab/ssl/gitlab.example.com.key uncomment the lines below ...
--> As our certiticates are named accordingly with the correct domain name, the Gitlab Container Registry also uses these certificates (and now our fullchain.pem). You can observe that while running an sudo gitlab-ctl reconfigure after you manually activated the registry_external_url 'https://gitlab.jonashackt.io:4567' inside the /etc/gitlab/gitlab.rb:
...
- create new file /var/opt/gitlab/nginx/conf/gitlab-registry.conf
- update content in file /var/opt/gitlab/nginx/conf/gitlab-registry.conf from none to 38ba8d
--- /var/opt/gitlab/nginx/conf/gitlab-registry.conf 2018-05-23 07:06:18.857687999 +0000
+++ /var/opt/gitlab/nginx/conf/.chef-gitlab-registry20180523-13668-614sno.conf 2018-05-23 07:06:18.857687999 +0000
@@ -1 +1,59 @@
+# This file is managed by gitlab-ctl. Manual changes will be
+# erased! To change the contents below, edit /etc/gitlab/gitlab.rb
+# and run `sudo gitlab-ctl reconfigure`.
+
+## Lines starting with two hashes (##) are comments with information.
+## Lines starting with one hash (#) are configuration parameters that can be uncommented.
+##
+###################################
+## configuration ##
+###################################
+
+
+server {
+ listen *:4567 ssl;
+ server_name gitlab.jonashackt.io;
+ server_tokens off; ## Don't show the nginx version number, a security best practice
+
+ client_max_body_size 0;
+ chunked_transfer_encoding on;
+
+ ## Strong SSL Security
+ ## https://raymii.org/s/tutorials/Strong_SSL_Security_On_nginx.html & https://cipherli.st/
+ ssl on;
+ ssl_certificate /etc/gitlab/ssl/gitlab.jonashackt.io.crt;
+ ssl_certificate_key /etc/gitlab/ssl/gitlab.jonashackt.io.key;
...
With this, we also don´t need to use the --tls-ca-file option to configure our gitlab-runners in letsencrypt.yml - the corresponding error is also gone now!
The gitlab-runner.yml shows how to install and register the Gitlab Docker Runner in non-interactive mode:
As https://docs.gitlab.com/runner/install/linux-repository.html#installing-the-runner states, we need to add the Gitlab Runner package repository and install the Runner via apt-get.
Before we´re able to register the Runner, we need to extract the Registration Token somehow automatically from our Gitlab instance. Since there´s no API at the moment (see https://gitlab.com/gitlab-org/gitlab-ce/issues/24030, https://gitlab.com/gitlab-org/gitlab-runner/issues/1727), we need to obtain it quite hacky through a database call.
# To register the Gitlab Runner, we need to obtain the Registration Token from our Gitlab instance
# Because this will change every time we start up Gitlab (and/or Vagrant Box/Ansible setup, see https://gitlab.com/gitlab-org/gitlab-ce/issues/3703)
# we need to access it somehow. Sadly there´s no API atm (see https://gitlab.com/gitlab-org/gitlab-ce/issues/24030,
# https://gitlab.com/gitlab-org/gitlab-runner/issues/1727), so we have to dive directly into the Gitlab database :(
- name: Extract Runner Registration Token via SQL query
become: true
become_user: gitlab-psql
vars:
ansible_ssh_pipelining: true
query: "SELECT runners_registration_token FROM application_settings ORDER BY id DESC LIMIT 1"
psql_exec: "/opt/gitlab/embedded/bin/psql"
gitlab_db_name: "gitlabhq_production"
shell: '{{ psql_exec }} -h /var/opt/gitlab/postgresql/ -d {{ gitlab_db_name }} -t -A -c "{{ query }}"'
register: gitlab_runner_registration_token_result
The last step then is to register the Gitlab Docker Runner in non-interactive mode.
https://docs.gitlab.com/ee/ci/docker/using_docker_build.html#using-the-gitlab-container-registry
https://docs.gitlab.com/ee/user/project/container_registry.html#build-and-push-images
Caution: Mind the Namespaces when working with Gitlab Container Registry!!!
https://docs.gitlab.com/ee/user/group/#namespaces
Now we´re nearly there. Just add a new password for the root user and login with that credentials. Then head over to to Create a project and there click on Import Project / Repo by URL:
Paste the example Projects git URL into Git repository URL field: https://github.com/jonashackt/restexamples.git, change Visibility Level to Internal and hit Create Project.
Now at CI / CD / Pipelines fire up the Pipeline once (only this time manually since we didn´t push something new) and it should build a simple Spring Boot example project and push the resulting Image into our branch new Gitlab Container Registry:
The example project restexamples has a prepared .gitlab-ci.yml already, so it should do everything smoothly:
# One of the new trends in Continuous Integration/Deployment is to:
# (see https://docs.gitlab.com/ee/ci/docker/using_docker_build.html)
#
# 1. Create an application image
# 2. Run tests against the created image
# 3. Push image to a remote registry
# 4. Deploy to a server from the pushed image
stages:
- build
- test
- push
- deploy
# see usage of Namespaces at https://docs.gitlab.com/ee/user/group/#namespaces
variables:
REGISTRY_GROUP_PROJECT: $CI_REGISTRY/root/restexamples
# see how to login at https://docs.gitlab.com/ee/ci/docker/using_docker_build.html#using-the-gitlab-container-registry
before_script:
- docker login -u $CI_REGISTRY_USER -p $CI_JOB_TOKEN $CI_REGISTRY
build-image:
stage: build
script:
- docker build . --tag $REGISTRY_GROUP_PROJECT/restexamples:latest
test-image:
stage: test
script:
- echo Insert fancy API test here!
push-image:
stage: push
script:
- docker push $REGISTRY_GROUP_PROJECT/restexamples:latest
deploy-2-dev:
stage: deploy
script:
- echo You should use Ansible here!
environment:
name: dev
url: https://dev.jonashackt.io
And you should be able to see your newly pushed Image in the Gitlab Registry overview:
And there´s also the Environments tab, witch is a great view on your Pipeline. Here you can track which Deployment went to which infrastructural stage:
-
Gitlab CI REFERENCE docs: https://docs.gitlab.com/ce/ci/yaml/README.html
-
Install Gitlab with Docker: https://docs.gitlab.com/omnibus/docker/
-
How to build Docker containers with Gitlab: https://docs.gitlab.com/ee/ci/docker/using_docker_build.html
-
Why to bind mount docker.sock into your Gitlab Docker Container (instead of using Docker-in-Docker): https://jpetazzo.github.io/2015/09/03/do-not-use-docker-in-docker-for-ci/
-
Good, but little old post abt installing Gitlab https://gitlabfan.com/setting-up-your-own-fully-functional-gitlab-https-registry-ci-runners-79901ac617c0
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