linux初始化mysql错误

ERROR! The server quit without updating PID file (/var/lib/mysql/localhost.localdomain.pid).

sudo chown -R mysql:mysql /var/lib/mysql
sudo chmod -R 755 /var/lib/mysql

ERROR! Found option without preceding group in config file: /etc/my.cnf at line 5.

sudo nano /etc/my.cnf

ERROR! The server quit without updating PID file (/var/lib/mysql/localhost.localdomain.pid).

sudo rm -rf /var/lib/mysql/*
sudo mysqld --initialize --user=mysql

ERROR! Bind on unix socket: No such file or directory

sudo netstat -tuln | grep 3306
sudo fuser -k 3306/tcp

ERROR! Out of memory during query execution.

sudo nano /etc/my.cnf

[mysqld]
innodb_buffer_pool_size = 1G

ERROR! The server quit without updating PID file (/var/lib/mysql/localhost.localdomain.pid).

sudo apt-get update
sudo apt-get install --reinstall mysql-server