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What is Docker?
=============================
Container mgmt tool.
1 APP 2 APP 5 APP
tool PS ---> 2VS --> 5Container
- save cost - 1GB 1GB -- 1GB
- save time 1 day 5 mn 1 sec
- imp quality
mgmt
- create - start - stop - restart - pause - up - kill - rm
Written in Go
by Docker
By Soloman Hykes
Release
Community
Enterprise
Version
24.x
-----------------------------------------------------
What is Container?
--------------------------------
Container a light weight APP env runtime powered kernal managed by Dockers
Container has
a user ns
1 net ns
1 pidtree ns
1 mnt ns
request byd docker to kernal....
=====================================================
VMS ---> VM Image(BOOTFS + ROOTFS + USERFS + APPFS)
Container --> Docker Image (ROOTFS + USERFS + APPFS)
======================================================
IN ORDER TO RUN APP
HARDWARE
KERNEL
NAMESPACE
USER
PID
NET
MNT (ROOTFS)
CGROUPS
Capabilites
Install Docker - \
https://www.devopsschool.com/blog/how-to-install-docker-in-linux/
Docker architecture
-----------------------------------------------
YOU --> Docker Client --> Docker Server --> ContainerD --> Kernel
-----------------
Check image in local REPO
download it from hub.docker.com
===================================
Docker engine
Component of Docker
----------------------------
Docker Engine
Docker images
From Docker Rergistry
hub.docker.com
Docker Container
YOU --> Docker Client --> Docker Server --> ContainerD --> Kernel
1 user
1 net
1 pid tree
1 mount(roofs) from image
=== container
250 sudo apt-get update
251 sudo apt-get install ca-certificates curl gnupg lsb-release
252 sudo mkdir -p /etc/apt/keyrings
253 curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
254 clear
255 echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
256 sudo apt-get update
257 sudo apt-get install docker-ce docker-ce-cli containerd.io docker-compose-plugin
258 clear
259 docker
260 clear
261 docker info
262 clear
263 docker version
264 which docker
265 which dockerd
266 which containerd
267 ps -eaf | grep docker
268 ps -eaf | grep containers
269 ps -eaf | grep containerd
270 history
============================================
==========================================================
209 ls
210 docker ps
211 docker ps -a
212 docker images
213 docker pull httpd
214 clear
215 docker images
216 docker ps
217 docker ps -a
218 docker create httpd\
219 docker create httpd
220 docker ps -a
221 docker create httpd
222 clear
223 docker ps -a
224 docker start bfe559b0cfb4
225 docker ps -a
226 docker start crazy_gould
227 docker ps -a
228 docker stop bfe559b0cfb4
229 clear
230 docker ps -a
231 docker restart 3f6c93e0de8a
232 docker ps -a
233 clea
234 clear
235 docker ps -a
236 docker pause 3f6c93e0de8a
237 docker ps -a
238 docker stats
239 docker ps -a
240 docker unpause 3f6c93e0de8a
241 docker ps -a
242 clear
243 docker ps -a
244 docker kill 3f6c93e0de8a
245 docker ps -a
246 docker rm bfe559b0cfb4 3f6c93e0de8a
247 clear
248 docker ps -a
=========================================
How to consume Container?
=====================================
--- Using SHELL
258 docker exec -it 1c15c991569f /bin/bash
259 docker exec 1c15c991569f ls
--- Using Network
263 docker inspect 1c15c991569f
264 curl http://172.17.0.2
==============================================
RUN
================================
pull + create + start + attach to a pid1 of the cont.
==============================================
RUN -d
================================
pull + create + start + DO NOT attach to a pid1 of the cont.
==================================
268 docker ps
269 docker attach 1c15c991569f
270 docker ps
271 docker ps -a
272 clear
273 docker run httpd
274 docker run -d httpd
275 docker ps
docker run -d -p 80:80 httpd
docker run -d -p 82:80 httpd
208 clear
209 docker run -d -p 80:80 httpd
210 docker run -d -p 81:80 httpd
211 netstat tulpn
212 netstat -tulpn
213 netstat
214 clear
215 docker run -d -p 82:80 httpd
216 docker ps
217 clear
218 docker ps
=================================================
How to create an Docker Images
========================================
==================================================================
What is Docker Image
--------------------------
collection of filesystem
----------------------------------
UBUNTU + JAVA + GIT + Apache2
-----------------------------
M 1- Using Existing Container
1 clear
2 apt-get install git
3 apt-get update
4 clear
5 ls
6 apt-get install git -y
7 git
8 clear
9 java
10 apt-get install openjdk-11-jdk -y
11 clear
12 java
13 cler
14 clea
15 clear
16 apt-get install apache2
17 git
18 java
19 which apache2
20 history
=======================
278 docker run -itd ubuntu
279 docker ps
280 clear
281 docker exec -it b96bcff46a70 /bin/bash
282 clear
283 docker history httpd
284 clear
285 ls
286 docker images
287 docker ps
288 docker exec b96bcff46a70 git
289 docker exec b96bcff46a70 java
290 docker exec b96bcff46a70 which apache2
291 clear
292 docker ps
293 docker history ubuntu
294 docker commit -m"ub-up-ap-java-git" -a"Rajesh Kumar" b96bcff46a70 ub-up-ap-java-git
295 docker images
296 clear
297 docker images
298 docker history ubuntu
299 docker history ub-up-ap-java-git
300 docker run -itd 04aeb5947f09
301 docker ps
302 docker images
303 docker run -itd ub-up-ap-java-git
304 docker images
305 docker ps
306 docker exec d95a3ad3b8da java
307 history
308 docker history ub-up-ap-java-git
309 history
==============================================
https://hub.docker.com/r/devopsschools/sataug2023
310 clear
311 docker images
312 docker into
313 docker info
314 clear
315 cd /var/lib/docker
316 ls
317 cd overlay2
318 ls
319 clear
320 ls
321 clear
322 cd
323 clear
324 ls
325 docker images
326 docker save -o ub-up-ap-java-git.tar ub-up-ap-java-git
327 ls
328 docker images
329 docker run -itd ubuntu
330 docker exec -it 1ad086930a58b318351ec3234791452f35ce66debf2e0bf1bf105d78678015e0
331 docker exec -it 1ad086930a58b318351ec3234791452f35ce66debf2e0bf1bf105d78678015e0 /bin/bash
332 clear
333 ls
334 docker ps
335 docker commit -m"hello world" -a"Rajesh Kumar" ubhello 1ad086930a58
336 docker commit -m"hello world" -a"Rajesh Kumar" 1ad086930a58 ubhello
337 clear
338 docker images
339 docker tag ubhello devopsschools/sataug2023
340 docker images
341 docker login
342 clear
343 docker images
344 docker push devopsschools/sataug2023
345 history
===================================================
Dockerfile
-------------------------------------------
FROM ubuntu
MAINTAINER Rajesh Kumar DevOps@rajeshkumar.xyz
RUN apt-get update
RUN apt-get install apache2 -y
RUN apt-get install git -y
COPY snap.tar /tmp
ENV JAVA_HOME /opt/java
Refr
- https://github.com/jenkinsci/docker/blob/587b2856cd225bb152c4abeeaaa24934c75aa460/Dockerfile
https://github.com/CentOS/sig-cloud-instance-images/blob/b2d195220e1c5b181427c3172829c23ab9cd27eb/docker/Dockerfile