Stateful Load Balancer with iptables and NAT Rumi, October 2, 2018October 2, 2018 Allow IP forwarding (Note: if your testing this on the same box your doing this on it won’t work, you need at least 3 machines to test this out, virtual ones work nicely) First we enable ipv4 forwarding or this will not work: # echo “1” > /proc/sys/net/ipv4/ip_forward XOR #… Continue Reading
Assign range of IP addresses to an interface Rumi, October 2, 2018 For example, you need to assign the IP range 192.168.10.6 – 192.168.10.100 to your eth0 interface. Create a range file in /etc/sysconfig/network-scripts/ifcfg-eth0-range0 as below DEVICE=eth0 BOOTPROTO=static IPADDR_START=192.168.10.6 IPADDR_END=192.168.10.100 NETMASK=255.255.255.0 CLONENUM_START=1 ONBOOT=yes TYPE=Ethernet CLONENUM_START is the number that will be assigned to the first IP alias interface (eth0:1 in this example)…. Continue Reading
Install CakePHP 3 On Ubuntu 16.04 Rumi, September 30, 2018September 30, 2018 This guide assumes you’ve set up a Ubuntu 14.04 server and have MYSQL up and running. This guide uses the “PHPMyAdmin” from the “One Click Apps” available on Digital Ocean running on a vps running Ubuntu 16.04. The smallest memory (512mb) should be enough to get you up and running…. Continue Reading
Installing Smokeping on Ubuntu 14.04 LTS Rumi, September 21, 2018 Installing Smokeping on Ubuntu used to be a total breeze. Since 14.04 however, it’s been a bit of a mission. This guide assumes a fresh out of the box Ubuntu install. I’m using the 64bit Server variety, but this should work on any 14.04 system. UPDATE – It also works… Continue Reading
Install Rocket Chat on Centos 7with Jitsi Video Conferencing Rumi, September 21, 2018 Add the epel repository and update everything. yum -y install epel-release nano && yum -y update Populate the yum repo with the mongodb-org repository nano /etc/yum.repos.d/mongodb-org.repo Paste this into the new file: [mongodb-org] name=MongoDB Repository baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.6/x86_64/ gpgcheck=1 enabled=1 gpgkey=https://www.mongodb.org/static/pgp/server-3.6.asc To write and save do: CTRL-O, CTRL-X Now we need to… Continue Reading
Reset CentOS Root Lost or Forgotten Password Rumi, September 21, 2018 In the event your Linux box experiences disk or file system issues you may receive a “Give root password for maintenance” prompt upon reboot. If you have your root password you can login but in the event your using ‘slide’ or ‘sudo’ for wheel access or you’ve just mis-placed your… Continue Reading
Install Cacti 1.1 on CentOS 7 Rumi, September 2, 2018 Cacti is a free and open source network monitoring and graphing tool written in PHP. With the help of RRDtool (Round-Robin database tool), Cacti can be used to provide various useful features, including remote and local data collectors, graph templating, network discovery, device management automation, etc. Prerequisites A fresh CentOS… Continue Reading
Fix: Unable to start TLS: SSL connect attempt failed error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed when connecting to ldap master.Cannot determine services – exiting Rumi, September 1, 2018 My ZImbra 8.6 was throwing the following error once after my letsencrypt SSL got expired: Unable to start TLS: SSL connect attempt failed error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed when connecting to ldap master.Cannot determine services – exiting The Fix: In order to fix the problem you need to modify the following… Continue Reading
Zimbra Letsencrypt SSL Renew – Zimbra 8.6 Rumi, September 1, 2018 Let’s Begin: This works if you already have an expired letsencrypt ssl certificate and assuming you have already deployed SSL in you zimbra system. However, if you come up here already, and would like to know how to setup letsencrypt on your system you may read my other article here:… Continue Reading
Zimbra – deleting all email in queue by sender Rumi, August 17, 2018January 15, 2022 As root user execute: /opt/zimbra/postfix/sbin/postqueue -p | tail -n +2 | awk ‘BEGIN { RS = “” } / sender@mail\.com/ { print $1 }’ | tr -d ‘*’ | /opt/zimbra/postfix/sbin/postsuper -d – To Delete ALL Messages From Queue /opt/zimbra/postfix/sbin/postsuper -d ALL or /opt/zimbra/common/sbin/postsupe -d ALL Another way to do this:… Continue Reading