Squids
From Wikitech
(Difference between revisions)
| Line 1: | Line 1: | ||
| − | == | + | ==DNS and squid== |
| + | * to add new IPs for squid: | ||
| + | ** add the IPs in /var/named/master/wikipedia.zone in the obvious places (on zwinger) | ||
| + | ** make sure to update the serial number in the zone file! | ||
| + | ** run <tt>rndc reload</tt> to make it update - no need to restart named | ||
| − | * browne: 207.142.131.235, 207.142.131.247 | + | * for 3 squids - use 6 IPs, to allow even load-balancing if 1 or 2 squids go down |
| − | + | * 2 scripts in /home/wikipedia/bin: | |
| − | + | ** takeip | |
| + | ** <strike>dropip</strike> (vapourware) | ||
| + | |||
| + | * some useful commands: | ||
| + | ** dig ANY en.wikipedia.org @zwinger.wikipedia.org | ||
| + | ** dig +short ANY en.wikipedia.org | ||
| + | ** | ||
| + | |||
| + | |||
| + | == Virtual IPs== | ||
| + | |||
| + | browne: 207.142.131.235, 207.142.131.247 | ||
| + | coronelli: 207.142.131.236, 207.142.131.248 | ||
| + | maurus: 207.142.131.245, 207.142.131.246 | ||
| + | |||
| + | * According to damyta, should use 255.255.255.255 for netmask for the IPs of virtual eth interfaces - otherwise there can be routing confusion. | ||
| + | * You must ping through the switch via a virtual interface which you have just brought up (using ping -I), to update the switch's idea of who has what IP. When pinging with -I207.142.131.248 or similar, use ''suda'' as the ping target; pinging the broadcast address ''does not always work''. | ||
| + | ** Can use script ''takeip'' in /h/w/bin to take over an IP if a squid goes down. | ||
| + | ** To take down a virtual eth interface, <tt>/sbin/ifconfig eth0:n down</tt> | ||
| + | ** TODO: set up ''heartbeat'' for automatic IP takeover. | ||
Revision as of 15:14, 13 June 2004
DNS and squid
- to add new IPs for squid:
- add the IPs in /var/named/master/wikipedia.zone in the obvious places (on zwinger)
- make sure to update the serial number in the zone file!
- run rndc reload to make it update - no need to restart named
- for 3 squids - use 6 IPs, to allow even load-balancing if 1 or 2 squids go down
- 2 scripts in /home/wikipedia/bin:
- takeip
-
dropip(vapourware)
- some useful commands:
- dig ANY en.wikipedia.org @zwinger.wikipedia.org
- dig +short ANY en.wikipedia.org
Virtual IPs
browne: 207.142.131.235, 207.142.131.247 coronelli: 207.142.131.236, 207.142.131.248 maurus: 207.142.131.245, 207.142.131.246
- According to damyta, should use 255.255.255.255 for netmask for the IPs of virtual eth interfaces - otherwise there can be routing confusion.
- You must ping through the switch via a virtual interface which you have just brought up (using ping -I), to update the switch's idea of who has what IP. When pinging with -I207.142.131.248 or similar, use suda as the ping target; pinging the broadcast address does not always work.
- Can use script takeip in /h/w/bin to take over an IP if a squid goes down.
- To take down a virtual eth interface, /sbin/ifconfig eth0:n down
- TODO: set up heartbeat for automatic IP takeover.
