poor man's cloud-init.sh for OCI OKE

Readme.md

• remove /var/oled
  • reddit
• create swap kubelet does not support swap; It leads unrecoverable node.
  • k8s swap: alpha support on 1.22 and beta on 1.28

cloud-init.sh

#!/bin/bash

#### remove /var/oled
# https://www.reddit.com/r/oraclecloud/comments/ywwp41/reclaiming_10gb_varoled/
# sudo lsof /var/oled
# sudo lsof /dev/mapper/ocivolume-oled
# "pcp" package is using it.
# https://community.oracle.com/customerconnect/discussion/673319/unable-to-remove-lvm-snapshot-logical-volume-xyz-contains-a-filesystem-in-use

sudo systemctl stop pmcd
sudo systemctl stop pmie
sudo systemctl stop pmlogger

# sudo umount /var/oled

### chatgpt generated umount waiting script
services=("pmcd" "pmie" "pmlogger")

for service in "${services[@]}"; do
  sudo systemctl stop $service
  count=0
  while sudo systemctl is-active --quiet $service; do
    sleep 1
    ((count++))
    if [ $count -ge 10 ]; then
      echo "$service service isn't stopped - max tries reached."
      break
    fi
  done
done

count=0
while ! sudo umount /var/oled; do
  echo "Unmounting failed, retrying in 5 seconds..."
  sleep 5
  ((count++))
  if [ $count -ge 10 ]; then
    echo "failed to unmount /var/oled - max tries reached."
    break
  fi
done
### end of chatgpt generated umount



# should empty
sudo lsof /var/oled
sudo lsof /dev/mapper/ocivolume-oled

# if any, grow fs first
sudo /usr/libexec/oci-growfs -y

# remove lvm
sudo lvchange -an /dev/mapper/ocivolume-oled
sudo lvremove -y /dev/mapper/ocivolume-oled
# https://access.redhat.com/solutions/44089
sudo lvextend -l +100%FREE /dev/mapper/ocivolume-root

# actual increase
sudo xfs_growfs /

# prepare log dir
sudo mkdir -p /var/oled/crash
sudo systemctl start pmcd pmie pmlogger

# comment out fstab
sudo sed -i '/\/var\/oled/s/^/#/' /etc/fstab


## init OKE
curl --fail -H "Authorization: Bearer Oracle" -L0 http://169.254.169.254/opc/v2/instance/metadata/oke_init_script | base64 --decode >/var/run/oke-init.sh
bash /var/run/oke-init.sh


# swap with kubernetes is beta and require further configuration. disabling it.
# swapfile 4gb
#dd if=/dev/zero of=/swapfile bs=1G count=4
#chmod 600 /swapfile
#mkswap /swapfile
#swapon /swapfile
#echo '/swapfile none swap sw 0 0' | tee -a /etc/fstab