How to check for syslog on Ubuntu 18.04

dmesg
# options:
dmesg | grep [keyword]

How to add swapp memory to Ubuntu 18.04

# to check swap:
swapon --show
# to show disk usage:
free -h

How to disable innodb in MySQL

# in /etc/mysql/mysql.conf.d/my.cnf
# add 
innodb=OFF
# in the [mysqld] section