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SCSI Bus Rescan
(2014-03-24) Problem You've hot-added a new disk and now want to use it without rebooting. Solution # echo "- - -" > /sys/class/scsi_host/host1/scan Change the "1" to the correct host bus number. This will detect the new disk and add it. Beware! If you add a ...
SquirrelMail: Users Can't Log In
(14 October 2012) Problem I have SquirrelMail version 1.4.8-5.el5.centos.13. When users attempt to log in, they get the message: Your session has expired, but will be resumed after logging in again. I have confirmed: the user password is correct; the user/pas...
SSL Certificate Warning
(2014-01-20) Problem Email: ################# SSL Certificate Warning ################ Certificate for hostname 'computer.domain', in file (or by nickname): /etc/pki/tls/certs/localhost.crt The certificate needs to be renewed; this can be done usi...
TCP Window Scaling
(5 November 2012) Problem: When sending mail to a particular target, we were unable to send messages above a certain size (around 500KB). The diagnostic on the relay was: MDeferred: Connection timed out with <site> Messages would go back into the queue, and a...
Unexpected CUPS dependencies
(or, isn't RPM supposed to handle this kind of crap?) Error: Filter "foomatic-rip" for printer (some printer) not available: No such file or directory Cause: cups is looking for foomatic. Solution: # yum install foomatic Error: /usr/lib/cups/filter/foomatic-r...
X Display Through SSH
(2014-03-24) Problem I ssh into a remote host and the $DISPLAY variable isn't set. Solution # yum install xorg-x11-xauth
Yum barf when updating package 'file'
Problem [dave@centos5-dave ~]$ sudo yum update file Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: netops.nexicom.net * updates: netops.nexicom.net * addons: netops.nexicom.net * extras: netops.nexicom.net Setting up Updat...
bind always returns SERVFAIL
(2013-04-16) Problem I have installed a bind instance from RPM and all it does is SERVFAIL. Debug logging shows this: 16-Apr-2013 12:08:35.875 resolver: debug 1: createfetch: google.ca A 16-Apr-2013 12:08:35.876 database: debug 1: decrement_reference: delete f...
Disable IPv6
(2014-09-16) Problem Things are slow. In our case, attempting to mount a previously-umounted filesystem would result in a five to seven second hang. Solution In /etc/sysconfig/network, add the line NETWORKING_IPV6=no See also below. Disable IPv6 everywhere. C...
Dummy Cert Expired
Problem I'm getting messages that say: ################# SSL Certificate Warning ################ Certificate for hostname 'voyager.xdroop.com', in file (or by nickname): /etc/pki/tls/certs/localhost.crt The certificate needs to be renewed; this can...
Firefox Java Plugin
Yeah, 2015 and this isn't a solved problem. Problem Java in Firefox. CentOS 6.6, 64-bit. Solution This worked for me: # wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie"...
Kickstart Ethernet Devices
(2014-02-17) Problem the specified interface eth0 does not exist Solution In the general case, specify your network configuration without specifying a specific device: #network --onboot yes --noipv6 --device=eth0 --bootproto=dhcp network --onboot yes --noipv6 ...
Minimal Install Can't Mount NFS Homedirs
(2014-05-13) Problem Install with @Base and @Core, plus ypbind and autofs. But once configured, the computer can't mount home directores: [root@dhcp-10-17-13-162 ~]# uptime 13:20:36 up 1 min, 1 user, load average: 0.00, 0.00, 0.00 [root@dhcp-10-17-13-162 ~]...
mod_fastcgi
(2016-02-24) Solution Fastcgi is available through RPMforge. To add the module: Install RPMforge, something like: # rpm -Uvh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm (it shouldn’t be too hard to chase down the cor...
netdisco-1.1-1.el6.noarch
(2013-05-29) How I Got NetDisco netdisco-1.1-1.el6.noarch Running On CentOS 6 From epel-testing: # yum --enablerepo=epel,epel-testing install netdisco Then run the netdisco_config script. Before you hit the web interface, you probably have to do something lik...
Force NFS v3 Mounts
(2014-07-17) Problem My CentOS 6 client is trying to mount everything using NFS v4 and I want it to use v3. Solution Change /etc/sysconfig/autofs: # Turn off v4 protocol support RPCNFSDARGS="-N 4" Change /etc/nfsmount.conf: # Protocol Version [2,3,4] # This d...
nfs v4: Nobody Ownership
(21 January 2013) Problem When I look at the files exported from my CentOS 6 server, everything's owned by "nobody". On the server, you'll see error messages like: Jan 21 12:47:31 centos6-7 nfsidmap[5071]: nss_getpwnam: '$USER@localdomain' does not map into do...
Client nis Setup
(2019-03-25) NIS client setup cookbook #!/bin/bash DOMAIN=my.nis.domain SERVERNAME=server4.my.nis.domain SERVERIP="1.2.3.4" rpm -ivh [http://download.fedoraproject.org/pub/epe...