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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -98,9 +98,9 @@ Docker command: `docker run -p 3306:3306 -d --name db-container-test -e MYSQL_USER=user -e MYSQL_PASSWORD=mysql -e MYSQL_ROOT_PASSWORD=root mysql:5.7` ### In detail `-p` map any request to port 3306 to my docker container port 3306 (3306 is the default port for MySQL). `-d` detached mode: this means the container runs in the background. `--name` allows us to assign a name to the container so we can interact with it if needed and also identify it. Resulting ``` -
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -8,7 +8,7 @@ We will use the hello.txt file for the example `docker run -v $(pwd):/app alpine cmd-to-exec` ### In detail `-v` mountes a volume in the container `$(pwd)` gets the current directory `:/app` mountes the $(pwd) in the /app directory of my container `alpine` the type of img we want the container to run @@ -34,10 +34,10 @@ Hello from container `docker run -it -v $(pwd):/app alpine /bin/sh` ### In detail `-i` run interactive `-t` run with terminal access. `-it` run interactive with terminal access. `/bin/sh` opens up a shell session. Resulting: @@ -57,9 +57,9 @@ Hello from container `docker run node:latest node -e "console.log(process.version)"` ### In detail `node:latest` specifies the version of the node img we want to use `node -e` executes node and tells it to evaluate the next command. `"console.log(process.version)"` the command that node evaluates. Resulting @@ -88,18 +88,19 @@ Hola Lele ## Running a DB in a container In this case we will run a MySQL db. MySQL needs a few env variables: MYSQL_USER, MYSQL_PASSWORD, MYSQL_ROOT_PASSWORD. We pass those values to our container using the `-e` flag. Each `-e` represents ONE env variable, so we pass it 3 times one for each env var. `-e MYSQL_USER=user -e MYSQL_PASSWORD=mysql -e MYSQL_ROOT_PASSWORD=root` The docker img we are going to use is mysql version 5.7 => `mysql:5.7` Docker command: `docker run -p 3306:3306 -d --name db-container-test -e MYSQL_USER=user -e MYSQL_PASSWORD=mysql -e MYSQL_ROOT_PASSWORD=root mysql:5.7` ### In detail `-p` map any request to port 3306 to my docker container port 3306 (3306 is the default port for MySQL). `-d` detached mode: this means the container runs in the background. `--name` allows us to assign a name to the container so we can interact with it if needed and also identify it. Resulting ``` @@ -124,8 +125,7 @@ a4ad797fef2714428a22817b5ef60e40a87cf1f641560c903b8a4209e843026b ## List the running containers To list the running containers we use the command `docker ps` Resulting: @@ -144,7 +144,7 @@ Resulting: a4ad797fef27 ``` If you relaunch the same container you'll get the following error: `docker run -p 3306:3306 -d --name db-container-test -e MYSQL_USER=user -e MYSQL_PASSWORD=mysql -e MYSQL_ROOT_PASSWORD=root mysql:5.7` Resulting: @@ -153,8 +153,8 @@ docker: Error response from daemon: Conflict. The container name "/db-container- See 'docker run --help'. ``` wtf? since the container already has a name assigned it conflicts with the container we want to launch How to fix this? 1) remove the contianer using `docker rm container-name` -
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Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,174 @@ # Docker 101 We will use the hello.txt file for the example `echo "Hello from container" > hello.txt` ## Map directory to container (aka copy local dir to container dir) `docker run -v $(pwd):/app alpine cmd-to-exec` ### In detail `-v` : mountes a volume in the container `$(pwd)` gets the current directory `:/app` mountes the $(pwd) in the /app directory of my container `alpine` the type of img we want the container to run `cmd-to-exec` example: `cat /app/hello.txt` ### Example `docker run -v $(pwd):/app alpine cat /app/hello.txt` Resulting: ``` ➜ docker run -v $(pwd):/app alpine cat /app/hello.txt Unable to find image 'alpine:latest' locally latest: Pulling from library/alpine 4c0d98bf9879: Already exists Digest: sha256:08d6ca16c60fe7490c03d10dc339d9fd8ea67c6466dea8d558526b1330a85930 Status: Downloaded newer image for alpine:latest Hello from container ``` ## Connect to the container and do stuff inside it `docker run -it -v $(pwd):/app alpine /bin/sh` ### In detail `-i` run interactive `-t` run with terminal access `-it` run interactive with terminal access `/bin/sh` opens up a shell session Resulting: ``` ➜ docker run -it -v $(pwd):/app alpine /bin/sh # cd app # ls apiKeys.js config.js index.js package-lock.json tmp assets hello.txt node_modules package.json # cat hello.txt Hello from container # exit ``` ## Executing node commands `docker run node:latest node -e "console.log(process.version)"` ### In detail `node:latest` specifies the version of the node img we want to use `node -e` executes node and tells it to evaluate the next command `"console.log(process.version)"` the command that node evaluates Resulting ``` ➜ docker run node:latest node -e "console.log(process.version)" v15.7.0 ``` #### Note: I can have `locally` (aka in my machine, not in a container) a different version installed: ``` ➜ node -v v12.15.0 ``` ## Pass ENV vars to a container: `docker run -e NAME=Lele node:latest node -e "console.log('Hola ' + process.env.NAME)"` Resulting ``` ➜ docker run -e NAME=Lele node:latest node -e "console.log('Hola ' + process.env.NAME)" Hola Lele ``` ## Running a DB in a container In this case we will run a MySQL db. MySQL needs a few env variables: MYSQL_USER, MYSQL_PASSWORD, MYSQL_ROOT_PASSWORD. We pass those values to our container using the `-e` flag. Each `-e` represents ONE env variable, so we pass it 3 times one for each env var. `-e MYSQL_USER=user -e MYSQL_PASSWORD=mysql -e MYSQL_ROOT_PASSWORD=root` The docker img we are going to use is mysql version 5.7 => `mysql:5.7` Docker command: `docker run -p 3306:3306 -d --name db-container-test -e MYSQL_USER=user -e MYSQL_PASSWORD=mysql -e MYSQL_ROOT_PASSWORD=root mysql:5.7` ### In detail `-p` map any request to port 3306 to my docker container port 3306 (3306 is the default port for MySQL) `-d` detached mode: this means the container runs in the background `--name` allows us to assign a name to the container so we can interact with it if needed and also identify it Resulting ``` ➜ docker run -p 3306:3306 -d --name db-container-test -e MYSQL_USER=user -e MYSQL_PASSWORD=mysql -e MYSQL_ROOT_PASSWORD=root mysql:5.7 Unable to find image 'mysql:5.7' locally 5.7: Pulling from library/mysql a076a628af6f: Already exists f6c208f3f991: Pull complete 88a9455a9165: Pull complete 406c9b8427c6: Pull complete 7c88599c0b25: Pull complete 25b5c6debdaf: Pull complete 43a5816f1617: Pull complete 1831ac1245f4: Pull complete 37677b8c1f79: Pull complete 27e4ac3b0f6e: Pull complete 7227baa8c445: Pull complete Digest: sha256:b3d1eff023f698cd433695c9506171f0d08a8f92a0c8063c1a4d9db9a55808df Status: Downloaded newer image for mysql:5.7 a4ad797fef2714428a22817b5ef60e40a87cf1f641560c903b8a4209e843026b ``` ## List the running containers To list the running containers we use the command `docker ps` Resulting: ``` ➜ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES a4ad797fef27 mysql:5.7 "docker-entrypoint.s…" 30 seconds ago Up 29 seconds 0.0.0.0:3306->3306/tcp, 33060/tcp db-container-test ``` ## Stop a running container `docker stop container-id` Resulting: ``` ➜ docker stop a4ad797fef27 a4ad797fef27 ``` If you relaunch the same container you'll get the following error: `docker run -p 3306:3306 -d --name db-container-test -e MYSQL_USER=user -e MYSQL_PASSWORD=mysql -e MYSQL_ROOT_PASSWORD=root mysql:5.7` Resulting: ``` docker: Error response from daemon: Conflict. The container name "/db-container-test" is already in use by container "a4ad797fef2714428a22817b5ef60e40a87cf1f641560c903b8a4209e843026b". You have to remove (or rename) that container to be able to reuse that name. See 'docker run --help'. ``` wtf? since the container already has a name assigned it conflicts with the container we want to launch How to fix this? 1) remove the contianer using `docker rm container-name` resulting: ``` ➜ docker rm db-container-test db-container-test ``` 2) use the `--rm` flag when launching a container `docker run -p 3306:3306 -d --name db-container-test -e MYSQL_USER=user -e MYSQL_PASSWORD=mysql -e MYSQL_ROOT_PASSWORD=root mysql:5.7 --rm` resulting: ``` ➜ docker run -p 3306:3306 -d --name db-container-test -e MYSQL_USER=user -e MYSQL_PASSWORD=mysql -e MYSQL_ROOT_PASSWORD=root mysql:5.7 --rm 7e9c5d495d3d04f6b2d2ac314eb60b7b53e362ba331cdb113be4014ef140170a ```