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RedHat Cluster Suite And Conga - Linux Clustering This how to describes an easy step by step installation of the RedHat Cluster Suite on three CentOS nodes and prepare them as nodes of a cluster. You will also install the Management suite which is web based and is known as Conga. You will use three nodes to form the cluster and one node as the cluster management node and as a cluster node it will not take part. All the nodes and the management node should be resolvable either by host file entries or by DNS. Cluster Nodes: cnode1 : eth0-192.168.2.151/24 - external-lan eth1-192.168.1.200/26 - internal-lan cluster cnode2 : eth0-192.168.2.152/24 - external-lan eth1-192.168.1.201/26 - internal-lan cluster cnode3 : eth0-192.168.2.153/24 - external-lan eth1-192.168.1.202/26 - internal-lan cluster Cluster Management Node: centos : eth0-192.168.2.150/24 As the cluster, its management interface and the service deamons use tcp, for the purpo...

Squid content filtering: Block / download of music MP3, mpg, mpeg, exec files Q. For security and to save bandwidth I would like to configure Squid proxy server such way that I do not want my users to download all of the following files: MP3 MPEG MPG AVG AVI EXE How do I configure squid content filtering? A. You can use squid ACL (access control list) to block all these files easily. How do I block music files using squid content filtering ACL? First open squid.conf file /etc/squid/squid.conf: # vi /etc/squid/squid.conf Now add following lines to your squid ACL section: acl blockfiles urlpath_regex "/etc/squid/blocks.files.acl" You want display custom error message when a file is blocked: # Deny all blocked extension deny_info ERR_BLOCKED_FILES blockfiles http_access deny blockfiles Save and close the file. Create custom error message HTML file called ERR_BLOCKED_FILES in /etc/squid/error/ directory or /usr/share/squid/errors/English directory. # vi ERR_BLOCKED_FILES...

ESXi and ESX Architectures Compared VMware ESX Architecture. In the original ESX architecture, the virtualization kernel (referred to as the vmkernel) is augmented with a management partition known as the console operating system (also known as COS or service console). The primary purpose of the Console OS is to provide a management interface into the host. Various VMware management agents are deployed in the Console OS, along with other infrastructure service agents (e.g. name service, time service, logging, etc). In this architecture, many customers deploy other agents from 3rd parties to provide particular functionality, such as hardware monitoring and system management. Furthermore, individual admin users log into the Console OS to run configuration and diagnostic commands and scripts. VMware ESXi Architecture. In the ESXi architecture, the Console OS has been removed and all of the VMware agents run directly on the vmkernel. Infrastructure services are p...