How do you answer yes for yum install automatically
You can use: yum -y install packagename The “-y” implies “yes”.
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How do I convert a .cer certificate to .pem?
Convert a DER file (.crt .cer .der) to PEM openssl x509 -inform der -in certificate.cer -out certificate.pem Source
How do you validate fstab without rebooting?
You can simple run: mount -a -a Mount all filesystems (of the given types) mentioned in fstab. This command will mount all (not-yet-mounted) filesystems mentioned in fstab and is used in system script startup during booting.
Sudo as different user and running screen
Try running script /dev/null as the user you su to before launching screen – its a ghetto little hack, but it should make screen happy.
Why is DNS failover not recommended?
By ‘DNS failover’ I take it you mean DNS Round Robin combined with some monitoring, i.e. publishing multiple IP addresses for a DNS hostname, and removing a dead address when monitoring detects that a server is down. This can be workable for small, less trafficked websites. By design, when you answer a DNS request you … Read more
How to start/stop/restart launchd services from the command line?
launchctl(8) is your friend. Just keep in mind that some of the services (sshd for example) are disabled in the configuration file so you will need to use the -w switch when loading them. Here is a sshd example: $ sudo launchctl load -w /System/Library/LaunchDaemons/ssh.plist You can stop the service using the unload subcommand. $ … Read more
Good tools that fit on a thumb drive [closed]
These are the utilities I have on my drive: CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer. ftpserver3lite is an FTP server ftpwanderer2 is an FTP client ipnetinfo answers questions about an IP address: owner, country/state, range, contact info, etc. miranda general messaging solution (supports most P2P … Read more
What is a glue record?
A glue record is a term for a record that’s served by a DNS server that’s not authoritative for the zone, to avoid a condition of impossible dependencies for a DNS zone. Say I own a DNS zone for example.com. I want to have DNS servers that’re hosting the authoritative zone for this domain so … Read more
What tool do you use to monitor your servers?
I’ve used Nagios in the past with success. It’s very extensible (over 200 add-ons), relatively easy to use and lots of reports. A negative would be the initial setup.
What are the different widely used RAID levels and when should I consider them?
RAID: Why and When RAID stands for Redundant Array of Independent Disks (some are taught “Inexpensive” to indicate that they are “normal” disks; historically there were internally redundant disks which were very expensive; since those are no longer available the acronym has adapted). At the most general level, a RAID is a group of disks … Read more