Microservices training
by john@xx.com
john.cloudlab.jnnapti.io
u/n: john pwd: john^^%
Microservices -> Springboot -> Docker -> kubbernates -> Openshift
Virtualization
Virtual Machine(VM)
Guest OS Hypervisor O/S H/W(RAM, Processor, Disk, Network)
Cloud : the difference is the way you use it. Managing the virtual machines and services.
- Openstack to build a private cloud
- AWS, Azure for public cloud
run on low power mode, only able to receive wake up call.
- IaaS
- PaaS
- SaaS
Container can run and terminate fast. a jailed process with segregated hardware resources no separate VM.
Container technology is part of kernal
Docker as a manager of containers.
RedHat yum install
Debian apt-get install
echo $?
if return 0, means previous command run successfully.
history gives all hostory commands
docker ps list all containers.
Rule of silence: if there is nothing to say, say nothing.
rm -rf /tmp/foo/f1 return nothing since rule of silence
docker pull images
docker run will create a jailed process - container
sudo docker attach dreamy_euclid
two monitor will be mirror
short switch -i long switch –name
docker run –help
ifconfig – interface config on windows, ipconfig
inet : 178.128.81.101
*CTL + R * for reverse search
[yuzhu@lab225 ~]$ docker ps
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
[yuzhu@lab225 ~]$ echo $?
1
[yuzhu@lab225 ~]$
systemctl status docker
cat /usr/lib/systemd/system/docker.service
[yuzhu@lab225 ~]$ systemctl enable docker
[yuzhu@lab225 ~]$ sudo docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
[yuzhu@lab225 ~]$ sudo docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
[yuzhu@lab225 ~]$ sudo docker run ubuntu:18.04 date
Unable to find image 'ubuntu:18.04' locally
Trying to pull repository docker.io/library/ubuntu ...
18.04: Pulling from docker.io/library/ubuntu
6cf436f81810: Pull complete
987088a85b96: Pull complete
b4624b3efe06: Pull complete
d42beb8ded59: Pull complete
Digest: sha256:7a47ccc3bbe8a451b500d2b53104868b46d60ee8f5b35a24b41a86077c650210
Status: Downloaded newer image for docker.io/ubuntu:18.04
Mon Mar 11 04:27:46 UTC 2019
[yuzhu@lab225 ~]$ echo $?
0
[yuzhu@lab225 ~]$ sudo docker run ubuntu:18.04 date
Mon Mar 11 04:28:57 UTC 2019
[yuzhu@lab225 ~]$ sudo docker stop determined_perlman
determined_perlman
[yuzhu@lab225 ~]$ sudo docker logs determined_perlman
docker ps -a | grep -v CONTAINER | awk '{print $NF}'
sudo docker attach dreamy_euclid
WM-C02TX3AGHTD8:~ yuzhu$ docker exec -it webserver /bin/bash
root@197985581a87:/usr/share/nginx/html# echo "<h1>hello from Yuanbo</h1>" > index.html
exit
sudo docker cp webserver:/usr/share/nginx/html webserver
[yuzhu@lab225 webserver]$ vi index.html
[yuzhu@lab225 webserver]$ sudo vi index.html
[yuzhu@lab225 webserver]$ sudo docker cp index.html webserver:/usr/share/nginx/html
docker run -d --name webserver -p 80:80 nginx
WM-C02TX3AGHTD8:docker yuzhu$ echo "<h1>Hello from yuabo XXX.</h1>" > index.html
WM-C02TX3AGHTD8:docker yuzhu$ docker cp index.html webserver2:/usr/share/nginx/html
WM-C02TX3AGHTD8:docker yuzhu$ docker commit webserver2 myapp:0.0.1
sha256:57fc60091301bd7778732b5553899885f72cc60c804b8f209a539f2278e1970f
[root@lab225 myapp]# cat Dockerfile
FROM nginx
RUN echo "<h1>Hello from Dockerfile</h1>" > /usr/share/nginx/html/index.html
[root@lab225 myapp]# docker build -t myapp:0.0.1 .
Sending build context to Docker daemon 2.048 kB
Step 1/2 : FROM nginx
---> 881bd08c0b08
Step 2/2 : RUN echo "<h1>Hello from Dockerfile</h1>" > /usr/share/nginx/html/index.html
---> Running in 56aee876dbeb
---> c4b6f864b819
Removing intermediate container 56aee876dbeb
Successfully built c4b6f864b819
WM-C02TX3AGHTD8:myapp yuzhu$ docker run -d --name myapp -p 9090:80 myapp:0.0.1
docker container ls
sudo su - switch to super user
[root@lab225 yuzhu]# docker rmi myapp:0.0.1 Untagged: myapp:0.0.1 Deleted: sha256:c4b6f864b819474b3906748df364509957eccdd17448b29fecc896f10ee92376 Deleted: sha256:ccb3cc4d2b66b53a69f29141708520b8d95b7b89ce255d533fd0ee6b1343185f
docker pull nginx
docker images
docker run --name webserver nginx
docker rm webserver
docker run -d --name webserver nginx
docker ps
docker run --help
docker ps
docker inspect webserver
docker inspect webserver | grep IP
docker rm -f webserver
docker run -d --name webserver -p 80:80 nginx
docker ps
docker exec -it webserver /bin/bash
docker diff webserver
docker images
docker cp
docker cp webserver:/usr/share/nginx/html webserver
docker cp index.html webserver:/usr/share/nginx/html
docker run -d --name webserver2 -p 6080:80 nginx
docker cp index.html webserver2:/usr/share/nginx/html
docker diff webserver2
cd /var/lib/docker/
docker ps
cd /var/lib/docker/
docker ps
docker stop webserver2
docker diff webserver2
docker commit
docker commit webserver2 myapp:0.0.1
docker images
docker rm -f webserver
docker rm -f webserver2
docker run -d --name webserver -p 80:80 myapp:0.0.1
----------------------------------------------------------
mkdir -p /data/mynginx
cd /data/mynginx
cat > Dockerfile <<DELIM
FROM ubuntu:18.04
RUN apt-get update && apt-get -y install nginx
CMD ["nginx", "-g", "daemon off;"]
DELIM
docker build -t mynginx:0.0.1 .
mkdir -p /data/myapp
cd /data/myapp
cat > Dockerfile <<DELIM
FROM mynginx:0.0.1
RUN echo "<h1>Hello from Dockerfile</h1>" > /var/www/html/index.html
RUN echo "<h1>About Dockerfile</h1>" > /var/www/html/about.html
DELIM
docker build -t myapp:0.0.1 .
docker run -d --name webserver -p 80:80 myapp:0.0.1
FROM ubuntu:18.04
RUN apt-get update && apt-get -y install openjdk-8-jdk
share location between contanier and host server
docker run -it --name java-dev -v /data/src:/src myjdk:0.0.1 /bin/bash
# In terminal 1
mkdir -p /data/myjdk
cd /data/myjdk
cat > Dockerfile <<DELIM
FROM ubuntu:18.04
RUN apt-get update && apt-get -y install openjdk-8-jdk
DELIM
docker build -t myjdk:8 .
docker run -it --name java-dev -v /data/src:/src myjdk:8 /bin/bash
# In a different terminal 2
cd /data/src
cat > HelloWorld.java <<DELIM
public class HelloWorld {
public static void main(String args[]) {
System.out.println("Hello World");
}
}
DELIM
# In terminal 1 - inside the container
cd /src
javac HelloWorld.java
java HelloWorld
https://github.com/buzypi/spring-boot-hello