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Wow, you guys really really ROCK. I did not at all expect for you to go ahead and install Zimbra. I just thought I would mention that on the order form to give you some statistics about what people are using the servers for (and give you a chance to say "hey, you need a bigger box for that"). Really. Wow. As usual you are going beyond the expected.
Working with Linux howtos
- Troubleshooting memory usage
- Moving files around: Setting up FTP
- Backup FTP server: offsite backups that you control
- SCP: an FTP alternative
- Automated incremental backups: Script to automate backups using SSHFS and rdiff-backup
- Securing your server: is your port showing?
- Securing your server: setting up a Linux firewall using IPTables and Webmin
- Preventing Brute Force SSH Attacks
- Backups with rSync
- Automated backups with RSync
- Accurate time with NTP
- Setting a UTC timezone
- Changing a hostname
- Application environment setup (using bash profiles)
Accurate Time with NTP
Accurate time is a "good thing". NTP (Network Time Protocol) lets you have it by keeping your server in sync with other (presumably accurate) server times.
Note: NTP is already running by default on RimuHosting servers).
Grab the RPM and install it: rpm -Uvf ntp-4.1.1a-9.i386.rpm libcap-1.10-12.i386.rpm
Tip: RPMFind.net is a great place to find the right RPM for you server installation.
Pop some servers in /etc/ntp.conf:
server tick.uh.edu
server time.nist.gov
server tick.usno.navy.mil
# choose your own servers from here: http://www.eecis.udel.edu/~mills/ntp/servers.html
driftfile /etc/ntp/ntp.drift
You should use more than one NTP server so that NTP can adjudicate time discrepancies. There is no point only having a single server listed. If that server's sysadmin then does some Y2100 testing it will cause your server's date to follow in lockstep.
Install it as a service:
chkconfig --add ntpd
chkconfig --level 35 ntpd on
/etc/init.d/ntpd start
A good NTP read: http://linux.oreillynet.com/pub/a/linux/2003/01/02/ntp.html
Resolving: Can't open /etc/ntp/ntp.drift.TEMP: Permission denied.
The fix to this permissions error to to run touch /etc/ntp/ntp.drift /etc/ntp/ntp.drift.TEMP; chown ntp /etc/ntp /etc/ntp/ntp.drift /etc/ntp/ntp.drift.TEMP