asr.tech.notes

Here is a handy command to see the current run level on AIX: # who -r  .        run-level 2 Aug 10 16:28       2    0    S

There are several ways to extract the expiration date from the certificate file. Here is one of the easiest way if you have the file locally: # openssl x509 –noout –in < cert_file >  -dates [root@mysystem][/opt/certificates ]> openssl x509 -noout -in private_key -dates notBefore=Jul 14 16:23:57 2010 GMT notAfter=Jul 14 16:23:57 2012 GMT

Network problem determination: AIX tools for a systems administrator

Nice reference for tcpdump! Tcpdump Recipes | danielmiessler.com

Few commands learned on SuSE Linux List version of SuSE Linux: # cat /etc/SuSE-release Restart network: # /sbin/rcnetwork restart Network config files under : /etc/sysconfig/network/ directory (ifcfg-<interface name> files) Routes in /etc/sysconfig/network/routes file Status of the Network: ifstatus <network interface name> Bring down netowork – ifdown <network interface name> Bring up network – ifup <network interface name> YaST – configuration tool for SuSE – pretty much all the system configuration can be done from this tool Generic LVM commands in Linux: List the physical disks installed: # fdisk –l Create Physical Volume (initialize physical disk for LVM) # pvcreate /dev/sdc [or any free device name] Create Volume group # vgcreate myvg /dev/sdc Create Logical Volume: # lvcreate –L 3G –n mylv myvg Display Commands # pvdisplay # vgdisplay # lvdisplay Create ext3 filesystem: # mkfs.ext3 mylv