centos

Install/Update OSSIM/OSSEC agent (AlmaLinux 8.6 or CentOS)

By cheesefather | October 25, 2022 - 12:25 pm |October 25, 2022 Linux

Install PHP 7.4 on CentOS 8

By cheesefather | November 9, 2021 - 3:19 pm |November 9, 2021 Linux

Install MySQL 5.6 on CentOS 8

By cheesefather | January 4, 2021 - 1:48 pm |January 4, 2021 Linux

3 Comments

VPS Benchmarks: Amazon EC2 and Lightsail, Azure, DigitalOcean, Google, Hostworld, Linode, OVH, UpCloud, VPSServer, VPS.net, Vultr

By cheesefather | June 29, 2020 - 2:29 pm |December 5, 2022 Linux

1 Comment

I recently needed to have a look at moving some services to a different VPS provider for redundancy so I decided to benchmark my options to compare them. The plan selected was whichever had 16GB of RAM (though Google is 15GB). The selected datacenter was always London (Azure only says… Continue reading →

Install OSSIM/OSSEC agent (CentOS 7)

By cheesefather | June 17, 2020 - 9:12 am |June 17, 2020 Linux

2 Comments

I couldn’t find proper instructions on doing this anywhere so here are mine: In your OSSIM portal go to Environment -> Assets & Groups -> Add Assets and enter the name/IP of the asset you want to add. On the agent run: yum -y install libevent-devel pcre2-devel openssl-develwget https://github.com/ossec/ossec-hids/archive/3.6.0.tar.gztar xzf… Continue reading →

Postfix ban failed logins script

By cheesefather | August 19, 2016 - 9:37 am |April 4, 2017 Linux

2 Comments

Fail2ban hasn’t been working for me, I still have people running brute force attacks on my Postfix server, so I though I’d rig up something myself. This consists of a bash script that identifies multiple failures and bans them, run on cron every 10 minutes. It checks for both smtp… Continue reading →

Linode Xen to KVM upgrade breaks quotas

By cheesefather | September 7, 2015 - 10:05 am |September 7, 2015 Linux

1 Comment

On a Linode Virtualmin CentOS 6 the upgrade from Xen to KVM breaks quotas with the following error: repquota: Cannot stat() mounted device /dev/root: No such file or directory The issue is that the symbolic link /dev/root is linking to /dev/xvda which has been replaced by /dev/sda so the symlink… Continue reading →

Fix nss-softokn rpm/yum issue in CentOS 6

By cheesefather | January 16, 2015 - 6:49 pm |January 17, 2015 Linux

1 Comment

The recent update to nss-softokn breaks rpm/yum updates in CentOS 6. To restore functionality run these commands: For 64-bit: # wget http://mirror.centos.org/centos/6/updates/x86_64/Packages/nss-softokn-freebl-3.14.3-19.el6_6.x86_64.rpm # rpm2cpio nss-softokn-freebl-3.14.3-19.el6_6.x86_64.rpm | cpio -idmv # cd lib64 # cp libfreeblpriv3.* /lib64 # yum update For 32-bit: # wget http://mirror.centos.org/centos/6/updates/i386/Packages/nss-softokn-freebl-3.14.3-19.el6_6.i686.rpm # rpm2cpio nss-softokn-freebl-3.14.3-19.el6_6.i686.rpm | cpio -idmv #… Continue reading →

WordPress Distributed Botnet Attack Blocker

By cheesefather | April 29, 2013 - 3:15 pm |May 2, 2013 Linux, Windows

33 Comments

After the recent global distributed botnet attack on WordPress installations that took down servers and broke into admin accounts, I thought I’d write a plugin to prevent it happening again. Distributed botnet attacks can come from multiple IP addresses and locations at the same time, so conventional IP-based lockouts are… Continue reading →

Dovecot brute-force blocking with fail2ban

By cheesefather | October 31, 2011 - 9:55 am |May 13, 2013 Linux

Tag Archives: centos

Install/Update OSSIM/OSSEC agent (AlmaLinux 8.6 or CentOS)

Install PHP 7.4 on CentOS 8

Install MySQL 5.6 on CentOS 8

Install OSSIM/OSSEC agent (CentOS 7)

Postfix ban failed logins script

Linode Xen to KVM upgrade breaks quotas

Fix nss-softokn rpm/yum issue in CentOS 6

Dovecot brute-force blocking with fail2ban

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