/docs/notes/devops/ Recent content in DevOps on Piotr Kosmowski Hugo -- gohugo.io pl-pl /docs/notes/devops/containers/ Mon, 01 Jan 0001 00:00:00 +0000 /docs/notes/devops/containers/ Init # docker run hello-world - run container from hello world image Samples # Application # cat > app.js <<EOF const http = require('http'); const hostname = '0.0.0.0'; const port = 80; const server = http.createServer((req, res) => { res.statusCode = 200; res.setHeader('Content-Type', 'text/plain'); res.end('Hello World\n'); }); server.listen(port, hostname, () => { console.log('Server running at http://%s:%s/', hostname, port); }); process.on('SIGINT', function() { console.log('Caught interrupt signal and will exit'); process.exit(); }); EOF Dockerfile # cat > Dockerfile <<EOF # Use an official Node runtime as the parent image FROM node:6 # Set the working directory in the container to /app WORKDIR /app # Copy the current directory contents into the container at /app ADD . /docs/notes/devops/gcp/ Mon, 01 Jan 0001 00:00:00 +0000 /docs/notes/devops/gcp/ Init # gcloud auth application-default login - acquire new user credentials to use for Application Default Credentials /docs/notes/devops/git/ Mon, 01 Jan 0001 00:00:00 +0000 /docs/notes/devops/git/ Basic commands # git init - Init local repo git status - displays status of the repository git diff --staged - diff to staged (commited) files to local repo git add -all - Add all changed, new and removed files git commit -m "Commit message" - performs commit of added files to the local repository git remote add origin https://github.com/kospiotr/sample-repo.git - add remote repository link to local repository git push origin master - transfers changes from local to remote repositories git push -u origin master - remember settings that next time you can use only git push git push origin --all - push everything to remote repository including branches git add --all & git commit -m "Update" & git push - add all, commit and push together git checkout discard changes in working directory git reset --hard - all changes will be reverted git clean -df - clean all untracked directories and files git clean -df && git reset --hard && git pull - discards any change and updates branch git branch | grep -v "master" | xargs git branch -d - removes all branchces except master and current Excluding files from repository # Reference: http://git-scm. /docs/notes/devops/jenkins/ Mon, 01 Jan 0001 00:00:00 +0000 /docs/notes/devops/jenkins/ Install # Create user: sudo adduser jenkins Add jenkins user as sudoer: sudo adduser jenkins sudo Login to that user: su jenkins Download Jenkins: wget http://mirrors.jenkins.io/war/latest/jenkins.war Create systemd init configuration in file: sudo vim /etc/systemd/system/jenkins.service with following content: [Unit] Description=Jenkins Daemon [Service] ExecStart=/usr/bin/java -jar /home/jenkins/jenkins.war --httpPort=8081 User=jenkins [Install] WantedBy=multi-user.target Reload service manager: sudo systemctl daemon-reload and you can now manage the service: systemctl start jenkins.service # starts the service manually systemctl stop jenkins. /docs/notes/devops/kubernetes/ Mon, 01 Jan 0001 00:00:00 +0000 /docs/notes/devops/kubernetes/ https://kubernetes.io/docs/user-guide/kubectl-cheatsheet/ source <(kubectl completion bash) Samples # Application # cat > app.js <<EOF const http = require('http'); const os = require("os"); const hostname = '0.0.0.0'; const port = 80; const server = http.createServer((req, res) => { console.log('Request: ' + req.url); res.statusCode = 200; res.setHeader('Content-Type', 'text/plain'); res.end('Hello World from ' + os.hostname() + '\n'); }); server.listen(port, hostname, () => { console.log('Server running at http://%s:%s/', hostname, port); }); process.on('SIGINT', function() { console. /docs/notes/devops/unix/ Mon, 01 Jan 0001 00:00:00 +0000 /docs/notes/devops/unix/ Commands # apt-cache policy <packageName> - check available version du -sh * - list all directories and files with its real size du -h * | sort -r | head -50 - 50 heaviest subdirectories with size tar -cvf archived-file.tar ./directory-to-archive - tar directory to file tar - xvf archived-file.tar - untar directory to file tar -czvf archived-file.tar.gz ./directory-to-archive - tar.gz directory to file tar - xzvf archived-file.tar.gz - untar. /docs/notes/devops/wsl/ Mon, 01 Jan 0001 00:00:00 +0000 /docs/notes/devops/wsl/ Installation # wsl --install Fixing DNS # From: https://superuser.com/questions/1191249/unable-to-resolve-host-name-in-wsl Create a wsl.conf file in the root etc folder (you may need sudo): sudo nano /etc/wsl.conf Paste the following lines in the file and exit saving it (Ctrl+X): [network] generateResolvConf = false Delete the symbolic link to the resolv.conf file: cd /etc sudo rm resolv.conf Create a new resolv.conf file in /etc: sudo nano resolv.conf Paste the following content into it saving it with (Ctrl+O and Ctrl+X):