Upon upgrading the Linux Kernel version (usually in CentOS 4.6 – 5) you may get the following error when trying to start APF: Unable to load iptables module (ipt_state), aborting. To fix this, open /etc/apf/internals/functions.apf and locate the following lines: ml ipt_state 1 ml ipt_multiport 1 And replace them with: ml xt_state ml xt_multiport Then… Continue reading APF “Unable to load iptables module” Error

To our surprise a bad yum release hosed several of our systems.  While the errors varied, the common link between them was the frightful message: rpmdb: PANIC: fatal region error detected; run recovery This problem can usually be corrected by running the following commands: cd /var/lib/rpm rm -f __db* rpm –rebuilddb -vv

The following error has been reported while doing yum updates on CentOS 4.x systems: –> Processing Dependency: glibc-common = 2.3.4-2.25 for package: glibc-dummy-centos-4 –> Finished Dependency Resolution Error: Missing Dependency: glibc-common = 2.3.4-2.25 is needed by package glibc-dummy-centos-4 To fix this error, the the following commands: yum remove glibc-dummy-centos-4 yum install gcc & yum install… Continue reading CentOS Yum GCC-Dummy Error

Among other problems you might not have noticed, phpMyAdmin might be giving you this error: phpMyAdmin – Error Cannot start session without errors, please check errors given in your PHP and/or webserver log file and configure your PHP installation properly. This means that your /tmp partition is full, or if you are on a VPS… Continue reading phpMyAdmin Error: Cannot start session

SSH repair and optimize all MySQL databases: # /usr/bin/mysqlcheck –repair –all-databases –password=xxxxxx # /usr/bin/mysqlcheck –optimize –all-databases –password=xxxxxx Upgrade/Downgrade to MySQL 4.x: backup database: # cd /root # /usr/bin/mysqldump –create-options –compatible=mysql40 –all-databases –force –user=root –password=xxxx > backup.sql

# vi /etc/my.cnf #opteron 852 4GB RAM [mysqld] safe-show-database max_connections = 500 key_buffer = 150M myisam_sort_buffer_size = 64M join_buffer_size = 1M read_buffer_size = 1M sort_buffer_size = 1M table_cache = 1024 thread_cache_size = 100 wait_timeout = 300 connect_timeout = 10 max_allowed_packet = 16M max_connect_errors = 10 query_cache_limit = 1M query_cache_size = 32M query_cache_type = 1 skip-innodb… Continue reading MySQL Optimization (my.cnf)

# vi /etc/sysctl.conf # Kernel sysctl configuration file for Red Hat Linux # # For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and # sysctl.conf(5) for more details. # Disables packet forwarding net.ipv4.ip_forward=0 # Disables IP source routing net.ipv4.conf.all.accept_source_route = 0 net.ipv4.conf.lo.accept_source_route = 0 net.ipv4.conf.eth0.accept_source_route = 0 net.ipv4.conf.default.accept_source_route = 0 # Enable… Continue reading Optimize sysctl.conf

login into the server as root. Go to the /usr/local/src/ folder and download the latest version of vsftpd……. # cd /usr/local/src/ # wget ftp://vsftpd.beasts.org/users/cevans…d-2.0.5.tar.gz untar the tar.gz file. # tar -zxvf vsftpd-2.0.5.tar.gz Go to the directory and run the make file. # cd vsftpd-2.0.5 # make Once it has finished compile and execute it #… Continue reading Install vsftpd

MySQL Backup mysqldump -u root -p DBNAME > BKPNAME.sql ———– MySQL Restore mysql -u root -p DBNAME < BKPNAME.sql You pay leave out the “-p” and it won’t ask you for the root password – -p, –password[=name] Password to use when connecting to server. If password is not given it’s asked from the tty.