a='hello world
hello world
hello world
hello world
hello world ad a a t t hello'
n=0
> result.txt
for word in $a
do
wcount=$(echo $a| grep -o $word | wc -l)
echo "$word : $wcount" >> result.txt
done
cat result.txt | uniqCategory: Uncategorized
recover files in linux using xfs_undelete and dd
yum install expect tcl tcllibdd if=/dev/sda | ssh USERNAME@IP_ADDR dd of=sda.isoxfs_undelete sda.isoMore :
https://github.com/ianka/xfs_undelete
https://unix.stackexchange.com/questions/132797/how-to-dd-a-remote-disk-using-ssh-on-local-machine-and-save-to-a-local-disk
Jenkins run shell script on worker node using ssh EOF
ssh-keygen -b 2048 -t rsa -f /tmp/sshkey -q -N ""ssh -o StrictHostKeyChecking=no -i /tmp/sshkey jenkins@192.168.0.183 << EOF
ls -ltr
hostname
EOFaws eks get k8 token kubectl
Note : If we creates eks cluster from UI it’s creates with different user and gives error when we do kubectl get pod
aws eks get-token --cluster-name eks1aws eks update-kubeconfig --name eks1aws sts get-caller-identityaws sts assume-role --role-arn "arn:aws:iam::1111111111:role/role-name" --role-session-name "tests3"aws --profile=default eks update-kubeconfig --name eks1aws eks create-cluster \
--region ap-south-1 \
--name eks1 \
--kubernetes-version 1.20 \
--role-arn arn:aws:iam::account_number:role/eks1-clst \
--resources-vpc-config subnetIds=subnet-093a2ddfcb7bc30b1,subnet-0475d9e26dfdc9d00,subnet-0274975b4af3513eeaws eks describe-cluster \
--region ap-south-1 \
--name eks1 \
--query "cluster.status"https://docs.aws.amazon.com/eks/latest/userguide/create-cluster.html
always check the minimum version of aws cli for eks
https://aws.amazon.com/premiumsupport/knowledge-center/eks-api-server-unauthorized-error/
Jenkins parameter and stash
pipeline {
agent {label 'master'}
parameters {
string(name: 'string1', defaultValue: 's1', description: 's1')
choice(name: 'CHOICES', choices: ['one', 'two', 'three'], description: 'chose')
password(name: 'password', defaultValue: 'SECRET', description: 'password')
}
stages{
stage('one'){
steps{
sh "echo abc > abc.txt"
stash includes: 'abc.txt', name: 'abc'
sh "rm -rf abc.txt"
}
}
stage('two'){
steps{
unstash 'abc'
sh "cat abc.txt"
}
}
}
}Jenkins stash and unstash
pipeline {
agent {label 'master'}
stages{
stage('one'){
steps{
sh "echo abc > abc.txt"
stash includes: 'abc.txt', name: 'abc'
sh "rm -rf abc.txt"
}
}
stage('two'){
steps{
unstash 'abc'
sh "cat abc.txt"
}
}
}
}Open port using NC command in linux
Open port using NC:
nc 8888Listen port:
nc localhost 8888
Send packet using bash:
echo -n "hello" >/dev/tcp/localhost/8888Mount cifs/samba share inside container
#Dockerfile
FROM ubuntu
RUN apt update -y
RUN apt install cifs-utils -y
docker build -t cifs .docker run -it --cap-add SYS_ADMIN --cap-add DAC_READ_SEARCH -cap-add NET_BIND_SERVICE cifs bash#centos with privileged (working)
docker run --privileged -it --cap-add SYS_ADMIN --cap-add DAC_READ_SEARCH --cap-add NET_BIND_SERVICE centos bashmount -t cifs -o username=a,password=a //192.168.0.228/public /mntmount -t cifs -o username=a,password=a //192.168.0.228/public /mntmount -t cifs -o username=a,password=a,ro,domain=WORKGROUP //192.168.0.228/public /a -vGet aws ec2 instance id from shell/bash
cat /sys/devices/virtual/dmi/id/board_asset_tag
#short hostname
hname=$(cat /sys/devices/virtual/dmi/id/board_asset_tag | awk '{print substr($0,5,15)}')
hostnamectl set-hostname $hname
Mysql allow from all – Test
CREATE USER 'root'@'%' IDENTIFIED BY 'Test#123';
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;