Ubuntu 16.04 - Utilities

add-swap.sh

# VARIABLES #
swapSize=4G

# EXECUTE #
# Check swap
sudo swapon -s
# Create swapfile
sudo fallocate -l $swapSize /swapfile
sudo chmod 600 /swapfile
ls -lh /swapfile
# Format swap file system
sudo mkswap /swapfile
# Apply swap
sudo swapon /swapfile
# Check swap
sudo swapon -s
free -m
# Persit enabling swap on startup
echo "/swapfile   none    swap    sw    0   0" | sudo tee -a /etc/fstab
# Optimize swap performance
sudo sysctl vm.swappiness=10
echo "vm.swappiness=10" | sudo tee -a /etc/sysctl.conf
sudo sysctl vm.vfs_cache_pressure=50
echo "vm.vfs_cache_pressure = 50" | sudo tee -a /etc/sysctl.conf

correct-system-clock-drift.sh

# AWS Ubuntu is very easy to be time drifted
# We have to fix it manually
# https://aws.amazon.com/premiumsupport/knowledge-center/system-clock-drift-ubuntu/
# https://www.digitalocean.com/community/tutorials/how-to-set-up-time-synchronization-on-ubuntu-16-04
sudo apt-get update
sudo apt-get install ntp -y
sudo service ntp status

# Enable on startup
sudo update-rc.d ntp enable

# Enable ntp sync
sudo timedatectl set-ntp yes
sudo timedatectl
# If check and still see that: NTP synchronized: no
# try to 
#sudo timedatectl set-ntp no
#sudo timedatectl set-ntp yes

logrotate-logstash.conf

/var/log/logstash/logstash-plain-*.log {
  daily
  rotate 30
  compress
  #delaycompress
  missingok
  notifempty
  nocreate
  dateext
  dateformat -es1
  extension .log
}

logrotate-symfony.conf

/data/www/deploy/project-name/shared/app/logs/prod-*.log {
  su www-data www-data
  daily
  rotate 30
  compress
  missingok
  notifempty
  nocreate
  dateext
  dateformat -web1
  extension .log
}