see ansible
see docker

How to connect into remote server:

in your client do:

from the terminal type: ssh-keygen and complete the steps

which creates id_rsa and id_rsa.pub files in ~/.ssh/ directory

do cat ~/.ssh/id_rsa.pub

copy everything

login to remote server

paste the text in ~/.ssh/authorized_keys

Do login via: ssh ec2-user@< public ip >

Docker

docker images

shows every container including stopped/running

docker ps -a

run a container detached mode

docker run -d --name tomcat-container -p 8081:8080 tomcat

-d : detached

--name tomcat-container : name of the container is tomcat-container

-p 8081:8080 : port inside 8080, external network

tomcat : name of the image (done by docker pull)

get inside container

docker exec -it tomcat-container /bin/bash

exec : Execute a command in a running container

-i,     --interactive     Keep STDIN open even if not attached

        --privileged     Give extended privileges to the command

-t,     --tty         Allocate a pseudo-TTY

stopping container

docker stop <container-name>

running Docker file:

cd ~
touch Dockerfile

inside Dockerfile:

FROM fedora:latest
RUN yum install java -y
RUN mkdir /opt/tomcat
WORKDIR /opt/tomcat
ADD https://dlcdn.apache.org/tomcat/tomcat-10/v10.1.19/bin/apache-tomcat-10.1.19.tar.gz .
RUN tar -xvzf apache-tomcat-10.1.19.tar.gz
RUN mv apache-tomcat-10.1.19 tomcat
EXPOSE 8080
CMD ["/opt/tomcat/bin/catalina.sh", "run"]

docker build -t mytomcat .

t      Name and optionally a tag

docker remove container

docker rm <container name>

delete all stopped containers

docker container prune

delete all images

docker image prune -a

Ansible

ansible all --list-hosts

ansible all -m gather_facts

collects and shows all the informations like procssor, memory, all of your env varibles and more

---

ansible all -m gather_facts --limit <ipAddr>

limit with one ip address

---

ansible all -m apt -a update_cache=true --become --ask-become-pass

after this enter a sudo passwd of the local system it will give this response

install vim-nox to server:

ansible all -m apt -a name=vim-nox --become --ask-become-pass

updating perticular package:

ansible all -m apt -a "name=openssl state=latest" --become --ask-become-pass

from the above code, we are updating openssl package

doing system upgrade and update:

ansible all -m apt -a "upgrade=dist" --become --ask-become-pass

install package via playbook:

ansible-playbook --ask-become-pass install_apache.yml

if server doesnt work then enable port 80

sudo firewall-cmd --add-port=80/tcp

List tags:

ansible-playbook --list-tags site.yml

Run playbook via tag having centos

ansible-playbook --tags centos --ask-become-pass site.yml

mutliple tags:

ansible-playbook --tags "db, apache" --ask-become-pass site.yml