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| Check Disk Size | mount df -h | |
| Check NFS | mount df -h | |
| Check File System | mount | ext3, ext4 |
| Check Memory Size | free -m | |
| Check Swap Size | free -m | |
| Check CPU Sockets | cat /proc/cpuinfo | grep "physical id" |sort | uniq | wc -l | |
| Check Network Interfaces | ifconfig -a |
| Check OS Version | cat /etc/redhat-release cat /etc/issue | |
| Check LANG | cat /etc/sysconfig/i18n echo $LANG | |
| Check Time Zone | date | |
| Check DNS | host XXXX #internal host xx.xx.xx.xx host www.google.com | |
| Check NTP | ntpq -p | grep ^server /etc/ntp.conf |
| Check SNMP | snmpwalk -v 2c localhost -c XXXX sysname | |
| Check Cron | grep "" /var/spool/cron/* |
| Check User | ls /home cat /etc/passwd | |
| Check LDAP | getent passwd getent group | |
| Check password | ssh localhost cat /etc/shadow | |
| Check sudoers | cat /etc/sudoers |grep -Ev "^#|^$" sudo ls | su - ; sudo ls |
| Check SSH | cat /etc/ssh/sshd_config |grep -i root | PermitRootLogin no |
| Check IP | ip addr |grep inet | |
| Check Routing | netstat -rn | |
| GW | ping GW ping 192.168.0.1 | |
| Check Bonding | grep -Ei "speed|interface|status|active" /proc/net/bonding/bond* |
| Check Service | chkconfig --list | |
| Check mail | netstat -an |grep :25 |