Difference between revisions of "CentOS6"
From Leaky
(Rate-limiting for rsyslog) |
(→Really flushing nscd cache: added kickstart network info) |
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$SystemLogRateLimitInterval 5 | $SystemLogRateLimitInterval 5 | ||
$SystemLogRateLimitBurst 500 | $SystemLogRateLimitBurst 500 | ||
| + | |||
| + | == Disable mingetty on extra tty == | ||
| + | |||
| + | Edit '''/etc/sysconfig/int''' so that | ||
| + | |||
| + | ACTIVE_CONSOLES=/dev/tty[1-6] | ||
| + | |||
| + | becomes | ||
| + | |||
| + | ACTIVE_CONSOLES=/dev/tty[1-2] | ||
| + | |||
| + | And then to stop the ones that are already running without rebooting: | ||
| + | |||
| + | # initctl stop tty TTY=/dev/tty6 | ||
| + | tty stop/waiting | ||
| + | |||
| + | Then repeat for the other ttys. | ||
| + | |||
| + | == named 'rndc status' not working == | ||
| + | |||
| + | [root@server6122 ~]# rndc status | ||
| + | rndc: connect failed: 127.0.0.1#953: connection refused | ||
| + | |||
| + | Check: | ||
| + | |||
| + | * Portreserve service may interfere with bind | ||
| + | # service portreserve stop; chkconfig portreserve off | ||
| + | * Permissions on /etc/rndc.key - group should be named, not root! | ||
| + | # ls -l /etc/rndc.key | ||
| + | -rw-r----- 1 root named 77 Jan 13 2014 /etc/rndc.key | ||
| + | |||
| + | == Really flushing nscd cache == | ||
| + | |||
| + | Originally copied from http://stijn.tintel.eu/blog/2012/05/10/how-to-really-flush-the-various-nscd-caches | ||
| + | |||
| + | The nscd caches are saved to disk, usually /var/db/nscd | ||
| + | |||
| + | [root@dev402 ~]# ls /var/db/nscd/ | ||
| + | group hosts netgroup passwd services | ||
| + | |||
| + | When you stop nscd, these files will just stay there, so restarting really doesn't flush your nscd caches. | ||
| + | What you need to do is use the --invalidate option, e.g.: | ||
| + | |||
| + | # nscd --invalidate=passwd | ||
| + | # nscd --invalidate=group | ||
| + | |||
| + | == Kickstart config IPv4 and IPv6 == | ||
| + | |||
| + | Two alternatives for specifying both IPv4 and IPv6 details in the kickstart config | ||
| + | |||
| + | 1. All the details on a single line and using --ipv6 and --ipv6gateway to specify the IPv6 details | ||
| + | |||
| + | network --device eth0 --bootproto static --ip=192.168.122.91 | ||
| + | --netmask=255.255.255.0 --gateway=192.168.122.1 --nameserver=192.168.122.1 | ||
| + | --hostname=centos6b-122.bocks.com --ipv6=2a02:af8:1000:82:8000::91/65 | ||
| + | --ipv6gateway=2a02:af8:1000:82:8000::1 | ||
| + | |||
| + | 2. Two separate network lines specifying the same device | ||
| + | |||
| + | network --device eth0 --bootproto static --ip=192.168.122.91 | ||
| + | --netmask=255.255.255.0 --gateway=192.168.122.1 --nameserver=192.168.122.1 | ||
| + | --hostname=centos6b-122.bocks.com | ||
| + | network --device eth0 --ipv6=2a02:af8:1000:82:8000::91/65 | ||
| + | --ipv6gateway=2a02:af8:1000:82:8000::1 | ||
| + | |||
| + | Both options seem to work in CentOS 6.6 although there are some webpages where people have said ipv6gateway doesn't work. | ||
Latest revision as of 23:18, 11 February 2015
Contents
Adjust rate-limiting for rsyslog
These instructions are for rsyslog 5.8.10 that comes with CentOS 6
/etc/rsyslog.conf
# Disable rate-limiting completely $SystemLogRateLimitInterval 0
or
# Set the rate limiting to 500 messages in 5s $SystemLogRateLimitInterval 5 $SystemLogRateLimitBurst 500
Disable mingetty on extra tty
Edit /etc/sysconfig/int so that
ACTIVE_CONSOLES=/dev/tty[1-6]
becomes
ACTIVE_CONSOLES=/dev/tty[1-2]
And then to stop the ones that are already running without rebooting:
# initctl stop tty TTY=/dev/tty6 tty stop/waiting
Then repeat for the other ttys.
named 'rndc status' not working
[root@server6122 ~]# rndc status rndc: connect failed: 127.0.0.1#953: connection refused
Check:
- Portreserve service may interfere with bind
# service portreserve stop; chkconfig portreserve off
- Permissions on /etc/rndc.key - group should be named, not root!
# ls -l /etc/rndc.key -rw-r----- 1 root named 77 Jan 13 2014 /etc/rndc.key
Really flushing nscd cache
Originally copied from http://stijn.tintel.eu/blog/2012/05/10/how-to-really-flush-the-various-nscd-caches
The nscd caches are saved to disk, usually /var/db/nscd
[root@dev402 ~]# ls /var/db/nscd/ group hosts netgroup passwd services
When you stop nscd, these files will just stay there, so restarting really doesn't flush your nscd caches. What you need to do is use the --invalidate option, e.g.:
# nscd --invalidate=passwd # nscd --invalidate=group
Kickstart config IPv4 and IPv6
Two alternatives for specifying both IPv4 and IPv6 details in the kickstart config
1. All the details on a single line and using --ipv6 and --ipv6gateway to specify the IPv6 details
network --device eth0 --bootproto static --ip=192.168.122.91 --netmask=255.255.255.0 --gateway=192.168.122.1 --nameserver=192.168.122.1 --hostname=centos6b-122.bocks.com --ipv6=2a02:af8:1000:82:8000::91/65 --ipv6gateway=2a02:af8:1000:82:8000::1
2. Two separate network lines specifying the same device
network --device eth0 --bootproto static --ip=192.168.122.91 --netmask=255.255.255.0 --gateway=192.168.122.1 --nameserver=192.168.122.1 --hostname=centos6b-122.bocks.com network --device eth0 --ipv6=2a02:af8:1000:82:8000::91/65 --ipv6gateway=2a02:af8:1000:82:8000::1
Both options seem to work in CentOS 6.6 although there are some webpages where people have said ipv6gateway doesn't work.
