-

docker useful commands

$ docker-machine ip
192.168.99.100

$ docker --version
Docker version 18.03.0-ce, build 0520e24302

$ docker-compose --version
docker-compose version 1.20.1, build 5d8c71b2
docker pull command will search for alpine into docker hub and pull it.
$ docker pull alpine
Using default tag: latest
latest: Pulling from library/alpine
4fe2ade4980c: Pull complete
Digest: sha256:621c2f39f8133acb8e64023a94dbdf0d5ca81896102b9e57c0dc184cadaf5528
Status: Downloaded newer image for alpine:latest
NOTE: Images will get pulled from docker hub in layers.

Hello-World

$ docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
d1725b59e92d: Pull complete
Digest: sha256:0add3ace90ecb4adbf7777e9aacf18357296e799f81cabc9fde470971e499788
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/
Download/fetch the Java8
$ docker pull java:8
8: Pulling from library/java
Digest: sha256:c1ff613e8ba25833d2e1940da0940c3824f03f802c449f3d1815a66b7f8c0e9d
Status: Image is up to date for java:8
If I want to pull specific/particular image
$ docker pull ubuntu:14.04
14.04: Pulling from library/ubuntu
aa1a66b8583a: Pull complete
aaccc2e362b2: Pull complete
a53116a2808f: Pull complete
b3a7298e318c: Pull complete
Digest: sha256:f961d3d101e66017fc6f0a63ecc0ff15d3e7b53b6a0ac500cd1619ded4771bd6
Status: Downloaded newer image for ubuntu:14.04

List Docker Images

$ docker images
REPOSITORY                             TAG                 IMAGE ID            CREATED             SIZE
kbastani/movies-ui                     latest              0a107de3a95e        40 minutes ago      761MB
kbastani/movie-microservice            latest              31ca109da9fa        41 minutes ago      819MB
kbastani/consul-microservice           latest              9e0b6f419feb        41 minutes ago      723MB
kbastani/hystrix-dashboard             latest              cb65337bc385        42 minutes ago      696MB
kbastani/config-microservice           latest              e706a42dfb09        43 minutes ago      724MB
kbastani/recommendation-microservice   latest              51cede9d96de        43 minutes ago      819MB
kbastani/api-gateway-microservice      latest              1056ed563cba        44 minutes ago      716MB
kbastani/discovery-microservice        latest              bc7809bb1600        44 minutes ago      726MB
kbastani/users-microservice            latest              ac3f5e3dc295        45 minutes ago      820MB

$ docker rmi ubuntu:14.04
Untagged: ubuntu:14.04
Untagged: ubuntu@sha256:f961d3d101e66017fc6f0a63ecc0ff15d3e7b53b6a0ac500cd1619ded4771bd6
Deleted: sha256:f17b6a61de28594fb3ec53b1cca7164fba66357d1635b414eeed4d586744342e
Deleted: sha256:62faa9fad606573b982c0444778746244947829aa8ebefbf29b3a5291875dc84
Deleted: sha256:5848a5ca21d07333dbdf428bbdde15d5c7cecc7614b24562b49b205d8d20199a
Deleted: sha256:cd509aa64a17350b03bf6af7f41d849fc273a0f2c9d1a309e897380617fca46e
Deleted: sha256:960c7c5516b277c5c23644b2cfb53d0106543eace96d517141611fa34e1b957c

docker run -d -P seqvence/static-site
Unable to find image 'seqvence/static-site:latest' locally
latest: Pulling from seqvence/static-site

fdd5d7827f33: Downloading [=======>                                           ] 7.318 MB/51.37 MB
fdd5d7827f33: Pull complete
a3ed95caeb02: Pull complete
716f7a5f3082: Pull complete
7b10f03a0309: Pull complete
aff3ab7e9c39: Pull complete
Digest: sha256:41b286105f913fb7a5fbdce28d48bc80f1c77e3c4ce1b8280f28129ae0e94e9e
Status: Downloaded newer image for seqvence/static-site:latest
e9da3f71a2065765e6a8e11cb85f6d4c8ed1868d75e77f58459558f840157f47


docker ps
CONTAINER ID        IMAGE                  COMMAND                  CREATED              STATUS              PORTS                                           NAMES
e9da3f71a206        seqvence/static-site   "/bin/sh -c 'cd /usr/"   About a minute ago   Up About a minute   0.0.0.0:32769->80/tcp, 0.0.0.0:32768->443/tcp   focused_noyce


http://ech-10-157-136-3:32769/

Remove specific Image, here IMAGE ID = f17b6a61de28

$ docker rmi f17b6a61de28
Untagged: ubuntu:14.04
Untagged: ubuntu@sha256:f961d3d101e66017fc6f0a63ecc0ff15d3e7b53b6a0ac500cd1619ded4771bd6
Deleted: sha256:f17b6a61de28594fb3ec53b1cca7164fba66357d1635b414eeed4d586744342e
Deleted: sha256:62faa9fad606573b982c0444778746244947829aa8ebefbf29b3a5291875dc84
Deleted: sha256:5848a5ca21d07333dbdf428bbdde15d5c7cecc7614b24562b49b205d8d20199a
Deleted: sha256:cd509aa64a17350b03bf6af7f41d849fc273a0f2c9d1a309e897380617fca46e
Deleted: sha256:960c7c5516b277c5c23644b2cfb53d0106543eace96d517141611fa34e1b957c

Remove Docker Images

  • docker rmi 
  • docker rmi  
  • docker rmi $(docker images -f "dangling=true" -q)
-quite, -q ==> Only shows numeric Ids -filter, -f ==> filter output based on condition provided.
-a, -all => Shows all containers (default shows just running). -q => Only displays numeric Ids.
  • docker images prune
  • Removes dangling images (images which are not used by any containers)

List running containers

$ docker ps -a
CONTAINER ID        IMAGE                                  COMMAND                  CREATED             STATUS                        PORTS               NAMES
e91cd8fbe0da        kbastani/hystrix-dashboard             "java -Djava.securit…"   About an hour ago   Exited (137) 31 minutes ago                       docker_hystrix_1
7368e0d8fc42        kbastani/api-gateway-microservice      "java -Djava.securit…"   About an hour ago   Exited (143) 31 minutes ago                       docker_gateway_1
f3cf5171ef33        kbastani/movies-ui                     "java -Djava.securit…"   About an hour ago   Exited (143) 31 minutes ago                       docker_moviesui_1
10ad4716e9b7        kbastani/movie-microservice            "java -Djava.securit…"   About an hour ago   Exited (1) 39 minutes ago                         docker_movie_1
f78f4df9206f        kbastani/users-microservice            "java -Djava.securit…"   About an hour ago   Exited (1) 39 minutes ago                         docker_user_1
fac92c7a4c26        kbastani/recommendation-microservice   "java -Djava.securit…"   About an hour ago   Exited (1) 39 minutes ago                         docker_recommendation_1
e8d4af14ceb6        kbastani/config-microservice           "java -Djava.securit…"   About an hour ago   Exited (143) 31 minutes ago                       docker_configserver_1
6a5223a4b1d1        kbastani/discovery-microservice        "java -Djava.securit…"   About an hour ago   Exited (143) 31 minutes ago                       docker_discovery_1

This is very cool

(Note: Make sure ubuntu latest image present in docker container)
$ docker run -it --name temp ubuntu:latest /bin/bash
root@4abe96b094af:/#
Note - Press Ctrl + P + Q get out of this

Kill all running containers

docker kill $(docker ps -q)

delete all stop containers

docker rmi $(docker ps -a -q)

delete all images

(Note: This will delete all layers of images)
docker rmi $(docker images -q)

Setup Redis

$ docker pull redis
Using default tag: latest
latest: Pulling from library/redis
a5a6f2f73cd8: Pull complete
a6d0f7688756: Pull complete
53e16f6135a5: Pull complete
f52b0cc4e76a: Pull complete
e841feee049e: Pull complete
ccf45e5191d0: Pull complete
Digest: sha256:010a8bd5c6a9d469441aa35187d18c181e3195368bce309348b3ee639fce96e0
Status: Downloaded newer image for redis:latest

$ docker run --name some-redis -d redis
9c309a278d2f2ddafc5b9f355dde74055781619d7323ea8f3125106faaff32c2

$ docker exec -it some-redis redis-cli
127.0.0.1:6379>

$ docker info
Containers: 8
 Running: 0
 Paused: 0
 Stopped: 8
Images: 69
Server Version: 18.06.1-ce
Storage Driver: aufs
 Root Dir: /mnt/sda1/var/lib/docker/aufs
 Backing Filesystem: extfs
 Dirs: 64
 Dirperm1 Supported: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 468a545b9edcd5932818eb9de8e72413e616e86e
runc version: 69663f0bd4b60df09991c08812a60108003fa340
init version: fec3683
Security Options:
 seccomp
  Profile: default
Kernel Version: 4.9.93-boot2docker
Operating System: Boot2Docker 18.06.1-ce (TCL 8.2.1); HEAD : c7e5c3e - Wed Aug 22 16:27:42 UTC 2018
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 995.6MiB
Name: default
ID: JCFC:EWS2:IQH7:T7FE:RKJ6:222L:4CZR:KOJZ:TDXN:EXBV:RDI5:QXMN
Docker Root Dir: /mnt/sda1/var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
No Proxy: 192.168.99.100
Registry: https://index.docker.io/v1/
Labels:
 provider=virtualbox
Experimental: false
Insecure Registries:
 127.0.0.0/8
Live Restore Enabled: false

Docker Swarm

Containers Vs VM

Docker containers are just isolated system environment run with the same kernel as host.

Docker Objects

  1. Images - Like VM, container image is template for containers. They consist mostly of file system, but also metadata about the container including how we should operate by default.
  • sharing image using docker commands
  • Docker manages images on host gives you the tools to transport them across host. Usually by registries.
  1. Containers - are instances of images, basically copies then isolated process inside them. To the process it looks as if it has own system based on the file system of image. They can change the file system but any changes have to be committed back to an image to persist.
  • Docker manages images like processes - meaning you can start, stop and run in the background, run interactively etc..
  1. Dockerfiles - are build files that instructs docker how to consistently configure container images.
  2. Registries - serve images you can pull from & push into from docker. Docker index is considered main public registry.
Layered - Copy on Write Filesystem
  • Content Layer
  • init layer
uses layer copy on write FS (File System) i.e., file you see on container when it start are actually file images in the system until changes are made.
Changes made in the container are collectively make up a layer & can be committed to an image. Images are just collection of layers on file system changes. This allows docker efficient with the disk space, also registries are important. Since they're aware about layers and cannot send layers, you dont have when you pull in images.
Containers are not just file systems, they run using commands. This command run in process isolation using namespace and 'C' groups.

Comments

Post a Comment

Popular posts from this blog

Install Redis on Oracle Linux 7+

-
Install Redis on Oracle Linux 7+ Install Redis Permalink In this section you’ll add the  EPEL  repository, and then use it to install Redis. Add the EPEL repository, and update YUM to confirm your change: sudo yum install epel-release sudo yum update Install Redis: sudo yum install redis Start Redis: sudo systemctl start redis Optional : To automatically start Redis on boot: sudo systemctl enable redis Verify the Installation Permalink Verify that Redis is running with  redis-cli : redis-cli ping If Redis is running, it will return: PONG Configure Redis Permalink In this section, you’ll configure some basic persistence and tuning options for Redis. Persistence Options Permalink Redis provides two options for disk persistence: Point-in-time snapshots of the dataset, made at specified intervals (RDB). Append-only logs of all the write operations performed by the server (AOF). Each option has its own pros and cons whic...
Read more
-
Image
Docker Tutorial with Hello World Example Docker  is a developer tool to package applications along with their runtime environment, so anybody can deploy and run them in any other machine without facing runtime environment conflicts. It is very similar to virtual machine concept ( virtualization ), where you can get a VM image and run it on any supporting hardware. All internal programs in VM will function as they were packaged originally. Difference between a VM and a docker image  is that docker image does not package whole virtual operating system. It uses the OS resources just like other process in developer’s machine, only application and it’s runtime specific dependencies are packaged ( Containerization ). Docker allows users to publish docker images and consume those published by others in repositories like  Docker Hub . In this tutorial, learn to  install Docker container in windows , to  create docker image  and to  deploy Docker i...
Read more
-
Microservices Using Spring Boot and Spring Cloud Microservices is the hot buzzword in software development and many organizations prefer building their enterprise applications using microservices architecture. In the Java community, Spring Boot is the most widely used framework for building both monoliths and microservices. I am planning to write a series of articles covering how to build microservices using  Spring Boot  and  Spring Cloud . In this article, we are going to learn about the following: Monoliths What are microservices? Advantages of microservices Challenges with microservices Why Spring Boot and Spring Cloud are a good choice for microservices Introducing the application Traditionally, we are building large enterprise applications in a modularized fashion (?!) but finally deploy them together as a single deployment unit (EAR or WAR). These are called monolithic applications. There are some issues with the monolithic architecture, s...
Read more