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stuttgart-things/docs/linux

BASH-SNIPPETS

TMUX 
# CREATE NEW SESSION
tmux new -s runner

# DETACH SESSION (= EXIT W/O END THE SESSION)
STRG + B + :detach

# LIST EXISTING SESSIONS
tmux ls

# ATTACH EXISTING SESSION
tmux a -t runner
REMOVE QUOTES FROM STRING 
echo inventory: 10.31.102.119", "10.31.102.111", "10.31.102.110 | sed 's/.\(.*\)/\0/'
REMOVE SPACE FROM STRING 
echo "   3918912k " | sed 's/ //g'
EXTRACT TAR.XZ 
tar -xf podlet-x86_64-unknown-linux-gnu.tar.xz
APPEND TEXT TO FIRST LINE OF FILE 
echo 'vsphere_vm_template="/path/to/template"' | cat -  /tmp/vsphere-vm-tfvars.tpl
TAR CURRENT DIR 
artifact_name=$(basename $PWD).tar.gz
touch ${artifact_name}
tar -czf ${artifact_name} --exclude=${artifact_name} .
SPLIT DELIMITED STRING 
branch=ubuntu23-labda-vsphere
echo $(echo $branch | cut -d "-" -f 1) #ubuntu23
echo $(echo $branch | cut -d "-" -f 2) #labda
echo $(echo $branch | cut -d "-" -f 3) #vsphere
SEARCH FOR PATTERN IN SUBFOLDERS 
SEARCH_PATH="/home/sthings/projects/ansible/test/collections/ansible_collections/sthings/deploy_rke/roles"
grep -A2 -B2 -Hrn 'ansible.builtin.include_role' ${SEARCH_PATH}
PRINT ARRAY IN ONE LINE w/ JQ 
files=(one two three)
jq -c -n '$ARGS.positional' --args "${files[@]}"
EXTRACTING A STRING BETWEEN LAST TWO SLASHES IN BASH 
string='/a/b/c/d/e'  # initial data
dir=${string%/*}     # trim everything past the last /
dir=${dir##*/}       # ...then remove everything before the last / remaining
printf '%s\n' "$dir" # demonstrate output
CHECK FOR VALUES IN ARRAY / EXCLUDE FROM ARRAY 
#! /bin/bash

DIR="/home/sthings/projects/ansible/test/roles"
DIRS=$(ls ${DIR})

EXCLUDE_ROLE="configure_rke_node"
ALL_ROLES=$(echo ${DIRS[@]/$EXCLUDE_ROLE})

CHECK_FOR="download_install_binary"

if [[ ${DIRS[@]/$ALL_ROLES} =~ $CHECK_FOR ]]
then
  echo "ROLE FOUND"
else
  echo "ROLE NOT FOUND"
fi
SEARCH AND REPLACE IN LOOP 
# GET ALL FILES
all_files=$(find test/install-configure-docker -type f)

# ECHO ALL FILES
echo $all_files

# SET NAMES
old=install-configure-docker
new=install_configure_docker

sed -i "s/${old}/${new}/g" $all_files
FIND, SEARCH AND REPLACE 
# SEARCH FOR ALL FILES IN (SUB-)FOLDERS
find sthings/deploy_rke/roles/install_cofigure_docker -type f

# SEARCH AND REPLACE FOR ALL (FOUND) FILES IN (SUB-)FOLDERS
sed -i 's/install-configure-docker/install_configure_docker/g' $(find sthings/deploy_rke/roles/install_cofigure_docker -type f)
STATIC IP UBUNTU23 
sudo cat <<EOF > /etc/netplan/00-installer-config.yaml
network:
  version: 2
  renderer: networkd
  ethernets:
    ens192:
      dhcp4: false
      dhcp6: false
      addresses:
        - 10.100.136.210/24
      routes:
        - to: default
          via: 10.100.136.254
      nameservers:
        addresses: [10.100.101.5]
EOF

sudo chmod 600 /etc/netplan/00-installer-config.yaml
sudo netplan --debug apply
CUT FOLDERPATH W/ SED FROM URL 
git clone https://github.com/stuttgart-things/stuttgart-things.git
cd $(echo $(params.REPO_URL) | sed 's|.*/||' | sed 's/.git//g')
# https://github.com/stuttgart-things/stuttgart-things.git -> stuttgart-things
SPLIT STRINGS BY DELIMITER (+-) W/ AWK 
path=$(awk -F+- '{print $1}' <<< 'git/data/github:token+-false+-GITHUB_TOKEN') # =git/data/github:token
convert=$(awk -F+- '{print $2}' <<< 'git/data/github:token+-false+-GITHUB_TOKEN') # =false
token=$(awk -F+- '{print $3}' <<< 'git/data/github:token+-false+-GITHUB_TOKEN') # =GITHUB_TOKEN
LOOP OVER PARAMETERS W/ SET + FOR LOOP 
set great foo bar # set parameters
echo "$@" # test output
for argument in "$@"; do echo $argument ; done # loop over parameters

# loop over parameters andchange +- to : w/ sed
for argument in "$@"; do echo $argument | sed -e "s/+-/: /g" ; done
CONCATENATE SET PARAMETERS + FOR LOOP 
set 'scanners vuln' 'timeout 30m'
output=" "; for argument in "$@"; do output=${output}'--'$argument' '; done
echo ${output} #--scanners vuln --timeout 30m
INSTALL PUB CERTS 
# UBUNTU/ALPINE
VAULT_URL_LABUL=https://vault.labul.sva.de:8200
VAULT_URL_LABDA=https://vault.tiab.labda.sva.de:8200
VAULT_URL_LABUL_VSPHERE=https://vault-vsphere.labul.sva.de:8200
VAULT_URL_LABUL_PVE=https://vault-pve.labul.sva.de:8200
VAULT_URL_LABDA_VSPHERE=https://vault-vsphere.tiab.labda.sva.de:8200

# INSTALL VAULT CERTS
sudo wget -O /usr/local/share/ca-certificates/labul-ca.crt ${VAULT_URL_LABUL}/v1/pki/ca/pem --no-check-certificate \
sudo wget -O /usr/local/share/ca-certificates/labda-ca.crt ${VAULT_URL_LABDA}/v1/pki/ca/pem --no-check-certificate \
sudo wget -O /usr/local/share/ca-certificates/labul-vsphere-ca.crt ${VAULT_URL_LABUL_VSPHERE}/v1/pki/ca/pem --no-check-certificate \
sudo wget -O /usr/local/share/ca-certificates/labda-vsphere-ca.crt ${VAULT_URL_LABDA_VSPHERE}/v1/pki/ca/pem --no-check-certificate \
sudo wget -O /usr/local/share/ca-certificates/labul-pve.crt ${VAULT_URL_LABUL_PVE}/v1/pki/ca/pem --no-check-certificate \
sudo update-ca-certificates
GET VERSION NUMBER W/ AWK 
python3 --version # Python 3.10.12
python3 --version | awk '{print $2}' # 3.10.12
UNTIL LOOP 
#!/bin/bash

until skopeo inspect docker://registry.fedoraproject.org/fedora:latest
do
    echo checking..
    sleep 1
done
CHECK TEKTON PIPELINERUN STATUS IN WHILE LOOP W/ OPERATORS 
#!/bin/bash
sleep=10
failed_prs=0
succeeded_prs=0
retries=0
max_retries=3

all_prs=$(tkn pr list -n tektoncd | grep -c alpine)
echo all pipelineRuns: ${all_prs}

while [[ ${failed_prs} -le 0  ]] || [[ ${succeeded_prs} -eq ${all_prs} ]] || [[ ${retries} -eq ${max_retries} ]]
do
    echo ${retries_left} retries left
    echo check/retry in ${sleep} seconds..
    sleep ${sleep}

    failed_prs=$(tkn pr list -n tektoncd | grep alpine | grep -c Failed)
    echo Failed pipelineRuns: ${failed_prs}
    tkn pr list -n tektoncd | grep alpine | grep Failed

    succeeded_prs=$(tkn pr list -n tektoncd | grep alpine | grep -c Succeeded)
    echo Succeeded pipelineRuns: ${succeeded_prs}
    tkn pr list -n tektoncd | grep alpine | grep Succeeded

    retries=`expr ${retries} + 1`
    retries_left=`expr ${max_retries} - ${retries}`
done

echo "Done watching pipelineRuns!"
echo Failed pipelineRuns: ${failed_prs}
echo Succeeded pipelineRuns: ${succeeded_prs}
DHCP Network config 
cat <<EOF > 99_config.yaml
network:
  version: 2
  renderer: networkd
  ethernets:
    eth0:
      dhcp4: true
EOF

sudo netplan apply
Enable ssh password authentication 
vi /etc/ssh/sshd_config
# set this variable to yes to allow passwords
PaswordAuthentication yes
# Restart Service
sudo systemctl restart ssh
# Copy public key to remote machine
ssh-copy-id [email protected]