Linux starts Oracle database

Linux starts Oracle database
1.1 to switch to Oracle user state: su - oracle
1.2 Start listener: lsnrctl start
1.3 Start oracle instance: #sqlplus / as sysdba
   >startup shutdown (close instance)


Problem description: memory_target not supported on this system
solution, Setup:
[root@FWDB ~]# mount -o remount,size=4G /dev/shm
[root@FWDB ~]# df -h | grep shm