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https://github.com/larzw/misc

misc
https://github.com/larzw/misc

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misc

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README 

        
# Git



## basic

git clone a // bring down repository from github



$git status



$git add .



$git commit -m "some text"



$git push // send your changes to github



$git pull // get updates from github



$git checkout -b // create branch and switch to it



$git checkout b // switch to branch b



$git branch // list branches



$ gith branch -D b // delete branch b



$ git log // shows commits



// remove a commited file



git rm file1.txt



git commit -m "remove file1.txt"



//Tags



Create and push tags



git tag 0.02



git push origin --tags



List tags



git tag



# github branches



// If github has a branch test and you want to bring it down localy



$git fetch origin // update local repo



$git switch -c test origin/test // get the github branch (look in github for the branch name)



// Now you can push/pull normally



// Delete the branch in github and then locally



$git push --set-upstream origin b // push local branch b to github



// Only need to do this once, then your can use normal $git push and $git pull



# Merge



$git checkout a // checkout branch a. This is where you want to merge you code into



$git merge b // this will merge branch b into branch a



$git merge --abort // abort merge



// fix merge conflicts



$ git status // files that have merge conflics



$ git add b.cpp



$ git commit -m "fixed merge conflict"



// rebase is an alternative



# rolling back code



// revert rolls code back by adding a commit (keeps history) safer



// rest re-writes history so it disapears



$ git reset --hard sha



// where sha is found via $git log and is the commit you want to go back to



ex.



123 commit 1



|



456 commit 2



|



789 commit 3



then git rest --hard 456 will take you to the state you were in for "456 commit 2"



# Docker



// For windows containers you need to run the folowing in PS

$ Enable-WindowsOptionalFeature -Online -FeatureName $("Microsoft-Hyper-V", "Containers") -All



$docker -v // run at command prompt



$ docker run hello-world // hello world container



// pulls image but does not run it.

docker pull foo



.dockerignore // like .gitignore



// FROM // specify base image



// WORKDIR /app // specify directy you start at when you enter the container (e.x. ~)



// COPY . . // Copy from to (local to container)



// ENV foo=1 // Enviornment variable foo = 1



// EXPOSE 3000 // Expose port 3000 for webapp



// RUN npn i // Run a command at docker build time



// CMD npm start // Run a command in docker (after it's built)



Dockerfile // specify command to create the image



// This will build the image you defined by the Dockerfile



$docker build -t some_name . // cd to where the Dockerfile is OR $docker image build -t some_name



$ docker image pull foo:bar // build the image e.g. like the FROM part in the Dockerfile



// shows you images you have built e.g. some_name



$docker image ls



$docker image rm -f image_name



## docker run

// run the image that you just built



$docker run -it same_name



// run the image that you just built and go to the shell



$docker run -it same_name sh



// run the image that you just built and expose the docker port 3000 to your local machine port 10 e.x. localhost:10



$docker run -p 10:3000 same_name // run the container



// run in detached mode



$docker run -d same_name



$docker run -rm // remove the container after it's stopped



$docker --name container_name image_name



// show running containers



$docker ps OR $docker container ls



// show stopped and running containers



docker ps -a



$docker exec -it the_NAMES_from_docker_ps sh // start a shell session on the detached docker image



// stop a container. The 123 is the CONTAINER ID from docker ps. You can also type $exit in the docker container or CTRL + C



$docker stop 123 or docker container stop 123



// start the container



$docker start 123 OR $docker start -i 123 // to start in interactive mode (yes it's just -i) or docker container start 123



// remove a container



$docker rm 123 or $docker container rm 123



## Volumes

Volumes presist data



// create a docker volume app-data



$docker volume create app-data



// list current volumes



$docker volume ls



// remove docker volume app-data

$docker volume rm app-data



// run the docker container and map the volume app-data to the docker folder /app/data (absolute path)

$docker run -d -p 10:3000 -v app-data:/app/data some_name



// user absolute paths



// share data between host and docker and it presits



docker run -it -v path_on_host:path_on_container



## Copy file Docker-> Host and Host->Docker NOTE these commands are issues on the host



//copy file.txt on the CONTAINER ID 123 to your local host "." (current directory)



$docker cp 123:app/data/file.txt .



//copy local file foo.txt to CONTAINER 123 and into the docker folder app/data



$docker cp foo.txt 123:app/data/