It’s very bad. Here is a list of examples of what I have first hand experience with consumer ISPs doing to fight the shortage of IPv4 addresses: Repeatedly shuffling around IPv4 blocks between cities causing brief outages and connection resets for customers. Shortening DHCP lease times from days to minutes. Allow users to choose if … Read more
You can use: yum -y install packagename The “-y” implies “yes”.
Convert a DER file (.crt .cer .der) to PEM openssl x509 -inform der -in certificate.cer -out certificate.pem Source
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.
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.
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
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
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
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
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.