docker - HackMD

docker === http://anandmanisankar.com/posts/docker-container-nginx-node-redis-example/ https://hackernoon.com/docker-tutorial-getting-started-with-python-redis-and-nginx-81a9d740d091 https://docs.docker.com/ ``` [eric_tu@localhost ~]$ sudo docker images sudo: /var/db/sudo/eric_tu writable by non-owner (040770), should be mode 0700 We trust you have received the usual lecture from the local System Administrator. It usually boils down to these three things: #1) Respect the privacy of others. #2) Think before you type. #3) With great power comes great responsibility. [sudo] password for eric_tu: REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/node 4 78fee52adcbf 13 days ago 651.1 MB docker.io/node latest 258031686918 13 days ago 666.6 MB docker.io/ubuntu latest d355ed3537e9 2 weeks ago 119.2 MB docker.io/ubuntu 14.04 4a2820e686c4 2 weeks ago 188 MB docker.io/hello-world latest 1815c82652c0 3 weeks ago 1.84 kB ``` sudo docker run node ls -l ``` [eric_tu@localhost ~]$ sudo docker run node ls -l sudo: /var/db/sudo/eric_tu writable by non-owner (040770), should be mode 0700 We trust you have received the usual lecture from the local System Administrator. It usually boils down to these three things: #1) Respect the privacy of others. #2) Think before you type. #3) With great power comes great responsibility. [sudo] password for eric_tu: total 12 drwxr-xr-x. 2 root root 4096 Jun 20 21:09 bin drwxr-xr-x. 2 root root 6 Apr 20 21:43 boot drwxr-xr-x. 5 root root 360 Jul 6 02:33 dev drwxr-xr-x. 56 root root 4096 Jul 6 02:32 etc drwxr-xr-x. 3 root root 18 Jun 23 00:57 home drwxr-xr-x. 9 root root 123 Jun 20 21:09 lib drwxr-xr-x. 2 root root 34 Jun 20 00:00 lib64 drwxr-xr-x. 2 root root 6 Jun 20 00:00 media drwxr-xr-x. 2 root root 6 Jun 20 00:00 mnt drwxr-xr-x. 3 root root 18 Jun 23 00:58 opt dr-xr-xr-x. 163 root root 0 Jul 6 02:33 proc drwx------. 3 root root 51 Jun 23 00:58 root drwxr-xr-x. 4 root root 45 Jul 6 02:33 run drwxr-xr-x. 2 root root 4096 Jun 20 00:00 sbin drwxr-xr-x. 2 root root 6 Jun 20 00:00 srv dr-xr-xr-x. 13 root root 0 Jul 6 01:02 sys drwxrwxrwt. 2 root root 6 Jun 20 21:09 tmp drwxr-xr-x. 10 root root 105 Jun 23 00:58 usr drwxr-xr-x. 11 root root 139 Jun 23 00:57 var ``` ``` [eric_tu@localhost ~]$ sudo docker run node /bin/sh sudo: /var/db/sudo/eric_tu writable by non-owner (040770), should be mode 0700 We trust you have received the usual lecture from the local System Administrator. It usually boils down to these three things: #1) Respect the privacy of others. #2) Think before you type. #3) With great power comes great responsibility. [sudo] password for eric_tu: ``` 甚麼事都沒發生? docker 在執行完任何命令後都會離開，所以想要持續互動的話就必須加上 -i 讓他不要執行完就exit. ``` -i, --interactive Keep STDIN open even if not attached ``` ``` [eric_tu@localhost ~]$ sudo docker run -it node /bin/sh sudo: /var/db/sudo/eric_tu writable by non-owner (040770), should be mode 0700 We trust you have received the usual lecture from the local System Administrator. It usually boils down to these three things: #1) Respect the privacy of others. #2) Think before you type. #3) With great power comes great responsibility. [sudo] password for eric_tu: # ls bin boot dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var # ``` ``` [eric_tu@localhost ~]$ docker --help Usage: docker [OPTIONS] COMMAND [arg...] docker [ --help | -v | --version ] A self-sufficient runtime for containers. Options: --config=~/.docker Location of client config files -D, --debug Enable debug mode -H, --host=[] Daemon socket(s) to connect to -h, --help Print usage -l, --log-level=info Set the logging level --tls Use TLS; implied by --tlsverify --tlscacert=~/.docker/ca.pem Trust certs signed only by this CA --tlscert=~/.docker/cert.pem Path to TLS certificate file --tlskey=~/.docker/key.pem Path to TLS key file --tlsverify Use TLS and verify the remote -v, --version Print version information and quit Commands: attach Attach to a running container build Build an image from a Dockerfile commit Create a new image from a container's changes cp Copy files/folders between a container and the local filesystem create Create a new container diff Inspect changes on a container's filesystem events Get real time events from the server exec Run a command in a running container export Export a container's filesystem as a tar archive history Show the history of an image images List images import Import the contents from a tarball to create a filesystem image info Display system-wide information inspect Return low-level information on a container, image or task kill Kill one or more running containers load Load an image from a tar archive or STDIN login Log in to a Docker registry. logout Log out from a Docker registry. logs Fetch the logs of a container network Manage Docker networks node Manage Docker Swarm nodes pause Pause all processes within one or more containers port List port mappings or a specific mapping for the container ps List containers pull Pull an image or a repository from a registry push Push an image or a repository to a registry rename Rename a container restart Restart a container rm Remove one or more containers rmi Remove one or more images run Run a command in a new container save Save one or more images to a tar archive (streamed to STDOUT by default) search Search the Docker Hub for images service Manage Docker services start Start one or more stopped containers stats Display a live stream of container(s) resource usage statistics stop Stop one or more running containers swarm Manage Docker Swarm tag Tag an image into a repository top Display the running processes of a container unpause Unpause all processes within one or more containers update Update configuration of one or more containers version Show the Docker version information volume Manage Docker volumes wait Block until a container stops, then print its exit code Run 'docker COMMAND --help' for more information on a command. ``` # Bulid a web app ``` -d, --detach Run container in background and print container ID ``` ``` [root@localhost eric_tu]# docker run -d seqvence/static-site Unable to find image 'seqvence/static-site:latest' locally Trying to pull repository docker.io/seqvence/static-site ... latest: Pulling from docker.io/seqvence/static-site fdd5d7827f33: Pull complete a3ed95caeb02: Pull complete 716f7a5f3082: Pull complete 7b10f03a0309: Pull complete aff3ab7e9c39: Pull complete Digest: sha256:41b286105f913fb7a5fbdce28d48bc80f1c77e3c4ce1b8280f28129ae0e94e9e c9df77ea8ff7d41510a3c9617d71345f618175f9934f8c2ba608891e00e26631 ``` ``` [root@localhost eric_tu]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES c9df77ea8ff7 seqvence/static-site "/bin/sh -c 'cd /usr/" About a minute ago Up About a minute 80/tcp, 443/tcp awesome_lalande 8bc3b78d6fa2 node "/bin/sh" 20 minutes ago Exited (0) 15 minutes ago sleepy_austin 409b4d7243bd node "/bin/sh" 21 minutes ago Exited (0) 21 minutes ago mad_leavitt 69efc485614a node "echo hi" 21 minutes ago Exited (0) 21 minutes ago gigantic_aryabhata fc3ea29bd24a node "ls -l" 23 minutes ago Exited (0) 23 minutes ago pedantic_torvalds 2401da561136 hello-world "/hello" 26 minutes ago Exited (0) 26 minutes ago stupefied_boyd d3d989e51eca ubuntu:14.04 "/bin/bash" 19 hours ago Exited (130) 19 hours ago pensive_jones e0dfa34694f7 node "/bin/bash" 5 days ago Exited (0) 5 days ago sad_visvesvaraya 7990bb7e2f90 ubuntu "/bin/bash" 5 days ago Exited (0) 5 days ago silly_bartik 93203c4149aa hello-world "/hello" 5 days ago Exited (0) 5 days ago ``` 停止與移除 ``` [root@localhost eric_tu]# docker stop c9df77ea8ff7 c9df77ea8ff7 [root@localhost eric_tu]# docker rm c9df77ea8ff7 c9df77ea8ff7 ``` 自訂義 In the above command: -d will create a container with the process detached from our terminal -P will publish all the exposed container ports to random ports on the Docker host -e is how you pass environment variables to the container --name allows you to specify a container name AUTHOR is the environment variable name and Your Name is the value that you can pass ``` [root@localhost eric_tu]# docker run --name static-site -e AUTHOR="Eric" -d -P dockersamples/static-site Unable to find image 'dockersamples/static-site:latest' locally Trying to pull repository docker.io/dockersamples/static-site ... latest: Pulling from docker.io/dockersamples/static-site Digest: sha256:daa686c61d7d239b7977e72157997489db49f316b9b9af3909d9f10fd28b2dec ce55eb8983bf946fd1e8098b43260970c8b4c50a26a3b73be028d3c362b3a828 ``` ``` [root@localhost eric_tu]# docker port --help Usage: docker port CONTAINER [PRIVATE_PORT[/PROTO]] List port mappings or a specific mapping for the container Options: --help Print usage [root@localhost eric_tu]# docker port static-site 443/tcp -> 0.0.0.0:32768 80/tcp -> 0.0.0.0:32769 ``` http://[YourDockerIP]:32769. # How to find docker ip ```docker inspect [CID]``` ``` [root@localhost eric_tu]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES ce55eb8983bf dockersamples/static-site "/bin/sh -c 'cd /usr/" 6 minutes ago Up 6 minutes 0.0.0.0:32769->80/tcp, 0.0.0.0:32768->443/tcp static-site 8bc3b78d6fa2 node "/bin/sh" 31 minutes ago Exited (0) 26 minutes ago sleepy_austin 409b4d7243bd node "/bin/sh" 32 minutes ago Exited (0) 32 minutes ago mad_leavitt 69efc485614a node "echo hi" 32 minutes ago Exited (0) 32 minutes ago gigantic_aryabhata fc3ea29bd24a node "ls -l" 34 minutes ago Exited (0) 34 minutes ago pedantic_torvalds 2401da561136 hello-world "/hello" 37 minutes ago Exited (0) 37 minutes ago stupefied_boyd d3d989e51eca ubuntu:14.04 "/bin/bash" 20 hours ago Exited (130) 20 hours ago pensive_jones e0dfa34694f7 node "/bin/bash" 5 days ago Exited (0) 5 days ago sad_visvesvaraya 7990bb7e2f90 ubuntu "/bin/bash" 5 days ago Exited (0) 5 days ago silly_bartik 93203c4149aa hello-world "/hello" 6 days ago Exited (0) 6 days ago pedantic_dijkstra [root@localhost eric_tu]# docker inspect ce55eb8983bf [ { "Id": "ce55eb8983bf946fd1e8098b43260970c8b4c50a26a3b73be028d3c362b3a828", "Created": "2017-07-06T03:01:24.496455445Z", "Path": "/bin/sh", "Args": [ "-c", "cd /usr/share/nginx/html \u0026\u0026 sed -e \"s/Docker/$AUTHOR/\" Hello_docker.html \u003e index.html ; nginx -g 'daemon off;'" ], "State": { "Status": "running", "Running": true, "Paused": false, "Restarting": false, "OOMKilled": false, "Dead": false, "Pid": 4244, "ExitCode": 0, "Error": "", "StartedAt": "2017-07-06T03:01:25.055523702Z", "FinishedAt": "0001-01-01T00:00:00Z" }, "Image": "sha256:f589ccde7957fa3ddf76a2eeee4d2f5d687b32176f559b703b6b8cacf6d36bc4", "ResolvConfPath": "/var/lib/docker/containers/ce55eb8983bf946fd1e8098b43260970c8b4c50a26a3b73be028d3c362b3a828/resolv.conf", "HostnamePath": "/var/lib/docker/containers/ce55eb8983bf946fd1e8098b43260970c8b4c50a26a3b73be028d3c362b3a828/hostname", "HostsPath": "/var/lib/docker/containers/ce55eb8983bf946fd1e8098b43260970c8b4c50a26a3b73be028d3c362b3a828/hosts", "LogPath": "", "Name": "/static-site", "RestartCount": 0, "Driver": "devicemapper", "MountLabel": "system_u:object_r:svirt_sandbox_file_t:s0:c171,c903", "ProcessLabel": "system_u:system_r:svirt_lxc_net_t:s0:c171,c903", "AppArmorProfile": "", "ExecIDs": null, "HostConfig": { "Binds": null, "ContainerIDFile": "", "LogConfig": { "Type": "journald", "Config": {} }, "NetworkMode": "default", "PortBindings": {}, "RestartPolicy": { "Name": "no", "MaximumRetryCount": 0 }, "AutoRemove": false, "VolumeDriver": "", "VolumesFrom": null, "CapAdd": null, "CapDrop": null, "Dns": [], "DnsOptions": [], "DnsSearch": [], "ExtraHosts": null, "GroupAdd": null, "IpcMode": "", "Cgroup": "", "Links": null, "OomScoreAdj": 0, "PidMode": "", "Privileged": false, "PublishAllPorts": true, "ReadonlyRootfs": false, "SecurityOpt": null, "UTSMode": "", "UsernsMode": "", "ShmSize": 67108864, "Runtime": "docker-runc", "ConsoleSize": [ 0, 0 ], "Isolation": "", "CpuShares": 0, "Memory": 0, "CgroupParent": "", "BlkioWeight": 0, "BlkioWeightDevice": null, "BlkioDeviceReadBps": null, "BlkioDeviceWriteBps": null, "BlkioDeviceReadIOps": null, "BlkioDeviceWriteIOps": null, "CpuPeriod": 0, "CpuQuota": 0, "CpusetCpus": "", "CpusetMems": "", "Devices": [], "DiskQuota": 0, "KernelMemory": 0, "MemoryReservation": 0, "MemorySwap": 0, "MemorySwappiness": -1, "OomKillDisable": false, "PidsLimit": 0, "Ulimits": null, "CpuCount": 0, "CpuPercent": 0, "IOMaximumIOps": 0, "IOMaximumBandwidth": 0 }, "GraphDriver": { "Name": "devicemapper", "Data": { "DeviceId": "61", "DeviceName": "docker-253:0-102807693-e1ae0c377ebe3005dac0d2a58a9a8bb7851f64ba4ef1c72edd29d0a2b3e9fbee", "DeviceSize": "10737418240" } }, "Mounts": [], "Config": { "Hostname": "ce55eb8983bf", "Domainname": "", "User": "", "AttachStdin": false, "AttachStdout": false, "AttachStderr": false, "ExposedPorts": { "443/tcp": {}, "80/tcp": {} }, "Tty": false, "OpenStdin": false, "StdinOnce": false, "Env": [ "AUTHOR=Eric", "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", "NGINX_VERSION=1.9.12-1~jessie" ], "Cmd": [ "/bin/sh", "-c", "cd /usr/share/nginx/html \u0026\u0026 sed -e \"s/Docker/$AUTHOR/\" Hello_docker.html \u003e index.html ; nginx -g 'daemon off;'" ], "Image": "dockersamples/static-site", "Volumes": null, "WorkingDir": "/usr/share/nginx/html", "Entrypoint": null, "OnBuild": null, "Labels": {} }, "NetworkSettings": { "Bridge": "", "SandboxID": "20b32752f98c5b13c306d398b8f3c0413979f031cf91119eb6e52b2a74b300e0", "HairpinMode": false, "LinkLocalIPv6Address": "", "LinkLocalIPv6PrefixLen": 0, "Ports": { "443/tcp": [ { "HostIp": "0.0.0.0", "HostPort": "32768" } ], "80/tcp": [ { "HostIp": "0.0.0.0", "HostPort": "32769" } ] }, "SandboxKey": "/var/run/docker/netns/20b32752f98c", "SecondaryIPAddresses": null, "SecondaryIPv6Addresses": null, "EndpointID": "4e509b02739a9357fb921131274dded34789110f3e3a60ce234c173e6c48e8c4", "Gateway": "172.17.0.1", "GlobalIPv6Address": "", "GlobalIPv6PrefixLen": 0, "IPAddress": "172.17.0.2", "IPPrefixLen": 16, "IPv6Gateway": "", "MacAddress": "02:42:ac:11:00:02", "Networks": { "bridge": { "IPAMConfig": null, "Links": null, "Aliases": null, "NetworkID": "8b50fd48fa113f350fef11a8b8c55146b33274fe5a22c8edfd3a91b46a438e4f", "EndpointID": "4e509b02739a9357fb921131274dded34789110f3e3a60ce234c173e6c48e8c4", "Gateway": "172.17.0.1", "IPAddress": "172.17.0.2", "IPPrefixLen": 16, "IPv6Gateway": "", "GlobalIPv6Address": "", "GlobalIPv6PrefixLen": 0, "MacAddress": "02:42:ac:11:00:02" } } } } ] ``` 訪問後就可以看到歡迎畫面 ``` [root@localhost eric_tu]# links http://172.17.0.1:32769 ``` #### 自訂義 port mapping You can also run a second webserver at the same time, specifying a custom host port mapping to the container’s webserver. ``` [root@localhost eric_tu]# docker run --name static-site-2 -e AUTHOR="Eric 2 " -d -p 8888:80 seqvence/static-site d35382f231bb792bb1f25874aff3071c834c38311a8c8418e2a41c2431bd9a47 ``` ``` [root@localhost eric_tu]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d35382f231bb seqvence/static-site "/bin/sh -c 'cd /usr/" 2 minutes ago Up 2 minutes 443/tcp, 0.0.0.0:8888->80/tcp static-site-2 ``` ``` [root@localhost eric_tu]# links http://172.17.0.1:8888 ``` 停止與移除 by name ``` [root@localhost eric_tu]# docker stop static-site static-site [root@localhost eric_tu]# docker rm static-site static-site [root@localhost eric_tu]# docker rm -f static-site-2 static-site-2 [root@localhost eric_tu]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 8bc3b78d6fa2 node "/bin/sh" 48 minutes ago Exited (0) 43 minutes ago sleepy_austin 409b4d7243bd node "/bin/sh" 49 minutes ago Exited (0) 49 minutes ago mad_leavitt 69efc485614a node "echo hi" 49 minutes ago Exited (0) 49 minutes ago gigantic_aryabhata fc3ea29bd24a node "ls -l" 52 minutes ago Exited (0) 51 minutes ago pedantic_torvalds 2401da561136 hello-world "/hello" 54 minutes ago Exited (0) 54 minutes ago stupefied_boyd d3d989e51eca ubuntu:14.04 "/bin/bash" 20 hours ago Exited (130) 20 hours ago pensive_jones e0dfa34694f7 node "/bin/bash" 5 days ago Exited (0) 5 days ago sad_visvesvaraya 7990bb7e2f90 ubuntu "/bin/bash" 5 days ago Exited (0) 5 days ago silly_bartik 93203c4149aa hello-world "/hello" 6 days ago Exited (0) 6 days ago pedantic_dijkstra [root@localhost eric_tu]# ``` # create and run app on your own container https://github.com/docker/labs/blob/master/beginner/chapters/webapps.md ``` 2.3.1 Create a Python Flask app that displays random cat pix For the purposes of this workshop, we've created a fun little Python Flask app that displays a random cat .gif every time it is loaded - because, you know, who doesn't like cats? Start by creating a directory called flask-app where we'll create the following files: app.py requirements.txt templates/index.html Dockerfile Make sure to cd flask-app before you start creating the files, because you don't want to start adding a whole bunch of other random files to your image. ``` 1. create app.py app進入點 ``` from flask import Flask, render_template import random app = Flask(__name__) # list of cat images images = [ "http://ak-hdl.buzzfed.com/static/2013-10/enhanced/webdr05/15/9/anigif_enhanced-buzz-26388-1381844103-11.gif", "http://ak-hdl.buzzfed.com/static/2013-10/enhanced/webdr01/15/9/anigif_enhanced-buzz-31540-1381844535-8.gif", "http://ak-hdl.buzzfed.com/static/2013-10/enhanced/webdr05/15/9/anigif_enhanced-buzz-26390-1381844163-18.gif", "http://ak-hdl.buzzfed.com/static/2013-10/enhanced/webdr06/15/10/anigif_enhanced-buzz-1376-1381846217-0.gif", "http://ak-hdl.buzzfed.com/static/2013-10/enhanced/webdr03/15/9/anigif_enhanced-buzz-3391-1381844336-26.gif", "http://ak-hdl.buzzfed.com/static/2013-10/enhanced/webdr06/15/10/anigif_enhanced-buzz-29111-1381845968-0.gif", "http://ak-hdl.buzzfed.com/static/2013-10/enhanced/webdr03/15/9/anigif_enhanced-buzz-3409-1381844582-13.gif", "http://ak-hdl.buzzfed.com/static/2013-10/enhanced/webdr02/15/9/anigif_enhanced-buzz-19667-1381844937-10.gif", "http://ak-hdl.buzzfed.com/static/2013-10/enhanced/webdr05/15/9/anigif_enhanced-buzz-26358-1381845043-13.gif", "http://ak-hdl.buzzfed.com/static/2013-10/enhanced/webdr06/15/9/anigif_enhanced-buzz-18774-1381844645-6.gif", "http://ak-hdl.buzzfed.com/static/2013-10/enhanced/webdr06/15/9/anigif_enhanced-buzz-25158-1381844793-0.gif", "http://ak-hdl.buzzfed.com/static/2013-10/enhanced/webdr03/15/10/anigif_enhanced-buzz-11980-1381846269-1.gif" ] @app.route('/') def index(): url = random.choice(images) return render_template('index.html', url=url) if __name__ == "__main__": app.run(host="0.0.0.0") ``` 2.create requirement.txt 拿來安裝python套件 ``` Flask==0.10.1 ``` 3. create view templates/index.html ``` <html> <head> <style type="text/css"> body { background: black; color: white; } div.container { max-width: 500px; margin: 100px auto; border: 20px solid white; padding: 10px; text-align: center; } h4 { text-transform: uppercase; } </style> </head> <body> <div class="container"> <h4>Cat Gif of the day</h4> <img src="{{url}}" /> <p><small>Courtesy: <a href="http://www.buzzfeed.com/copyranter/the-best-cat-gif-post-in-the-history-of-cat-gifs">Buzzfeed</a></small></p> </div> </body> </html> ``` 4.config DockerFile ``` # our base image FROM alpine:3.5 # Install python and pip RUN apk add --update py2-pip # install Python modules needed by the Python app COPY requirements.txt /usr/src/app/ RUN pip install --no-cache-dir -r /usr/src/app/requirements.txt # copy files required for the app to run COPY app.py /usr/src/app/ COPY templates/index.html /usr/src/app/templates/ # tell the port number the container should expose EXPOSE 5000 # run the application CMD ["python", "/usr/src/app/app.py"] ``` 5. build ``` [root@localhost learnDocker]# docker build --help Usage: docker build [OPTIONS] PATH | URL | - Build an image from a Dockerfile Options: --build-arg value Set build-time variables (default []) --cgroup-parent string Optional parent cgroup for the container --cpu-period int Limit the CPU CFS (Completely Fair Scheduler) period --cpu-quota int Limit the CPU CFS (Completely Fair Scheduler) quota -c, --cpu-shares int CPU shares (relative weight) --cpuset-cpus string CPUs in which to allow execution (0-3, 0,1) --cpuset-mems string MEMs in which to allow execution (0-3, 0,1) --disable-content-trust Skip image verification (default true) -f, --file string Name of the Dockerfile (Default is 'PATH/Dockerfile') --force-rm Always remove intermediate containers --help Print usage --isolation string Container isolation technology --label value Set metadata for an image (default []) -m, --memory string Memory limit --memory-swap string Swap limit equal to memory plus swap: '-1' to enable unlimited swap --no-cache Do not use cache when building the image --pull Always attempt to pull a newer version of the image -q, --quiet Suppress the build output and print image ID on success --rm Remove intermediate containers after a successful build (default true) --shm-size string Size of /dev/shm, default value is 64MB -t, --tag value Name and optionally a tag in the 'name:tag' format (default []) --ulimit value Ulimit options (default []) -v, --volume value Set build-time bind mounts (default []) [root@localhost learnDocker]# docker build -t eric:myfirstapp "docker build" requires exactly 1 argument(s). See 'docker build --help'. Usage: docker build [OPTIONS] PATH | URL | - Build an image from a Dockerfile [root@localhost learnDocker]# docker build . -t eric:myfirstapp Sending build context to Docker daemon 7.68 kB Step 1 : FROM alpine:3.5 Trying to pull repository docker.io/library/alpine ... 3.5: Pulling from docker.io/library/alpine 019300c8a437: Pull complete Digest: sha256:af2a5bd2f8de8fc1ecabf1c76611cdc6a5f1ada1a2bdd7d3816e121b70300308 ---> 074d602a59d7 Step 2 : RUN apk add --update py2-pip ---> Running in e585442a4f59 fetch http://dl-cdn.alpinelinux.org/alpine/v3.5/main/x86_64/APKINDEX.tar.gz fetch http://dl-cdn.alpinelinux.org/alpine/v3.5/community/x86_64/APKINDEX.tar.gz (1/12) Installing libbz2 (1.0.6-r5) (2/12) Installing expat (2.2.0-r1) (3/12) Installing libffi (3.2.1-r2) (4/12) Installing gdbm (1.12-r0) (5/12) Installing ncurses-terminfo-base (6.0-r7) (6/12) Installing ncurses-terminfo (6.0-r7) (7/12) Installing ncurses-libs (6.0-r7) (8/12) Installing readline (6.3.008-r4) (9/12) Installing sqlite-libs (3.15.2-r0) (10/12) Installing python2 (2.7.13-r0) (11/12) Installing py-setuptools (29.0.1-r0) (12/12) Installing py2-pip (9.0.0-r1) Executing busybox-1.25.1-r0.trigger OK: 61 MiB in 23 packages ---> f364a2331ad3 Removing intermediate container e585442a4f59 Step 3 : COPY requirements.txt /usr/src/app/ ---> 1064e28c9427 Removing intermediate container 9bb3f951f819 Step 4 : RUN pip install --no-cache-dir -r /usr/src/app/requirements.txt ---> Running in ca9dc85c142b Collecting Flask==0.10.1 (from -r /usr/src/app/requirements.txt (line 1)) Downloading Flask-0.10.1.tar.gz (544kB) Collecting Werkzeug>=0.7 (from Flask==0.10.1->-r /usr/src/app/requirements.txt (line 1)) Downloading Werkzeug-0.12.2-py2.py3-none-any.whl (312kB) Collecting Jinja2>=2.4 (from Flask==0.10.1->-r /usr/src/app/requirements.txt (line 1)) Downloading Jinja2-2.9.6-py2.py3-none-any.whl (340kB) Collecting itsdangerous>=0.21 (from Flask==0.10.1->-r /usr/src/app/requirements.txt (line 1)) Downloading itsdangerous-0.24.tar.gz (46kB) Collecting MarkupSafe>=0.23 (from Jinja2>=2.4->Flask==0.10.1->-r /usr/src/app/requirements.txt (line 1)) Downloading MarkupSafe-1.0.tar.gz Installing collected packages: Werkzeug, MarkupSafe, Jinja2, itsdangerous, Flask Running setup.py install for MarkupSafe: started Running setup.py install for MarkupSafe: finished with status 'done' Running setup.py install for itsdangerous: started Running setup.py install for itsdangerous: finished with status 'done' Running setup.py install for Flask: started Running setup.py install for Flask: finished with status 'done' Successfully installed Flask-0.10.1 Jinja2-2.9.6 MarkupSafe-1.0 Werkzeug-0.12.2 itsdangerous-0.24 You are using pip version 9.0.0, however version 9.0.1 is available. You should consider upgrading via the 'pip install --upgrade pip' command. ---> c39058fad9b3 Removing intermediate container ca9dc85c142b Step 5 : COPY app.py /usr/src/app/ ---> a9349662edcc Removing intermediate container f1222f9e34ef Step 6 : COPY templates/index.html /usr/src/app/templates/ ---> efd6a7c7b687 Removing intermediate container ca63fcdfb84a Step 7 : EXPOSE 5000 ---> Running in 0000200e1536 ---> f13d6c45e77c Removing intermediate container 0000200e1536 Step 8 : CMD python /usr/src/app/app.py ---> Running in 9e35d0e364ff ---> 0933c43e0ec4 Removing intermediate container 9e35d0e364ff Successfully built 0933c43e0ec4 ``` 5.run ``` [root@localhost learnDocker]# docker run -p 8888:5000 --name myfirstapp eric:myfirstapp File "/usr/src/app/app.py", line 25 return render_template('index.html', url=url) ^ IndentationError: unexpected indent ``` 噴錯QQ python 的縮排有特別要求 --- 3）错误的使用缩进量。（导致“IndentationError：unexpected indent”、“IndentationError：unindent does not match any outer indetation level”以及“IndentationError：expected an indented block”）记住缩进增加只用在以：结束的语句之后，而之后必须恢复到之前的缩进格式。该错误发生在如下代码中： print('Hello!') print('Howdy!') 或者： if spam == 42: print('Hello!') print('Howdy!') 或者： if spam == 42: print('Hello!') --- 編輯完之後重新build ``` [root@localhost learnDocker]# vim app.py [root@localhost learnDocker]# docker build . -t eric:myfirstapp Sending build context to Docker daemon 7.68 kB Step 1 : FROM alpine:3.5 ---> 074d602a59d7 Step 2 : RUN apk add --update py2-pip ---> Using cache ---> f364a2331ad3 Step 3 : COPY requirements.txt /usr/src/app/ ---> Using cache ---> 1064e28c9427 Step 4 : RUN pip install --no-cache-dir -r /usr/src/app/requirements.txt ---> Using cache ---> c39058fad9b3 Step 5 : COPY app.py /usr/src/app/ ---> f588b0a29cbd Removing intermediate container a658fb1a3ed5 Step 6 : COPY templates/index.html /usr/src/app/templates/ ---> 9b7b5465cbe4 Removing intermediate container 1bff9b36c433 Step 7 : EXPOSE 5000 ---> Running in 88238c9ce73f ---> 266154aeb49d Removing intermediate container 88238c9ce73f Step 8 : CMD python /usr/src/app/app.py ---> Running in f29320972d6c ---> 49d4582c3324 Removing intermediate container f29320972d6c Successfully built 49d4582c3324 ``` 再run一遍 ``` [root@localhost learnDocker]# docker run -p 8888:5000 --name myfirstapp eric:myfirstapp /usr/bin/docker-current: Error response from daemon: Conflict. The name "/myfirstapp" is already in use by container 90fead17e58e8f7a5fa278b8175d980165a76936029b5c3ff66b24ea97e31a09. You have to remove (or rename) that container to be able to reuse that name.. See '/usr/bin/docker-current run --help'. [root@localhost learnDocker]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE eric myfirstapp 49d4582c3324 About a minute ago 57.39 MB <none> <none> 0933c43e0ec4 15 minutes ago 57.39 MB docker.io/alpine 3.5 074d602a59d7 8 days ago 3.988 MB docker.io/node 4 78fee52adcbf 13 days ago 651.1 MB docker.io/node latest 258031686918 13 days ago 666.6 MB docker.io/ubuntu latest d355ed3537e9 2 weeks ago 119.2 MB docker.io/ubuntu 14.04 4a2820e686c4 2 weeks ago 188 MB docker.io/hello-world latest 1815c82652c0 3 weeks ago 1.84 kB docker.io/dockersamples/static-site latest f589ccde7957 15 months ago 190.5 MB docker.io/seqvence/static-site latest f589ccde7957 15 months ago 190.5 MB [root@localhost learnDocker]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 90fead17e58e 0933c43e0ec4 "python /usr/src/app/" 7 minutes ago Exited (1) 7 minutes ago myfirstapp 8bc3b78d6fa2 node "/bin/sh" About an hour ago Exited (0) About an hour ago sleepy_austin 409b4d7243bd node "/bin/sh" About an hour ago Exited (0) About an hour ago mad_leavitt 69efc485614a node "echo hi" About an hour ago Exited (0) About an hour ago gigantic_aryabhata fc3ea29bd24a node "ls -l" 2 hours ago Exited (0) About an hour ago pedantic_torvalds 2401da561136 hello-world "/hello" 2 hours ago Exited (0) 2 hours ago stupefied_boyd d3d989e51eca ubuntu:14.04 "/bin/bash" 21 hours ago Exited (130) 21 hours ago pensive_jones e0dfa34694f7 node "/bin/bash" 6 days ago Exited (0) 6 days ago sad_visvesvaraya 7990bb7e2f90 ubuntu "/bin/bash" 6 days ago Exited (0) 6 days ago silly_bartik 93203c4149aa hello-world "/hello" 6 days ago Exited (0) 6 days ago pedantic_dijkstra [root@localhost learnDocker]# docker rm myfirstapp myfirstapp [root@localhost learnDocker]# docker run -p 8888:5000 --name myfirstapp eric:myfirstapp * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit) ``` Head over to http://localhost:8888 and your app should be live. Note If you are using Docker Machine, you may need to open up another terminal and determine the container ip address using docker-machine ip default. 由於 run 的時候把 5000 port mapping 到本地的 8888 prot 所以訪問8888可以看到結果: ``` [eric_tu@localhost ~]$ links http://127.0.0.1:8888 ```

Syntax	Example	Reference
# Header	Header	基本排版
- Unordered List	Unordered List
1. Ordered List	Ordered List
- [ ] Todo List	Todo List
> Blockquote	Blockquote
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19^th^	19^th
H~2~O	H₂O
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==Marked text==	Marked text
[link text](https:// "title")	Link
![image alt](https:// "title")	Image
`Code`	`Code`	在筆記中貼入程式碼
```javascript var i = 0; ```	`var i = 0;`
:smile:		Emoji list
{%youtube youtube_id %}	Externals
$L^aT_eX$	L^aT_eX
:::info This is a alert area. :::	This is a alert area.