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(newest | oldest) View (newer 50 | older 50) (20 | 50 | 100 | 250 | 500)- 11:18, 21 May 2022 Saurabh talk contribs created page CentOS 9.x NFS (Created page with "Home > CentOS > CentOS 9.x > CentOS 9.x file sharing > CentOS 9.x NFS *CentOS 9.x Configure basic NFSv4 server for sharing folders between two machines")
- 11:17, 21 May 2022 Saurabh talk contribs created page CentOS 9.x file sharing (Created page with "Home > CentOS > CentOS 9.x > CentOS 9.x file sharing *CentOS 9.x NFS")
- 11:17, 21 May 2022 Saurabh talk contribs created page CentOS 9.x (Created page with "Home > CentOS > CentOS 9.x *CentOS 9.x file sharing")
- 03:27, 20 May 2022 Saurabh talk contribs created page Creating RDSH Automatic Instant Clone Farms (Created page with "Home > VMWare platform > VMWare Horizon > Creating RDSH Automatic Instant Clone Farms =Theory= In case of Desktop OS pools with dedicated VM per user we can create the pool directly using Golden images as explained at Creating Windows 2019 or Windows 10 Desktop Pool. However in case of RDSH shared desktop pools using Windows server OS where a single VM can be used by multiple users concurrently, we need to first create a farm of RDS hosts...")
- 02:59, 20 May 2022 Saurabh talk contribs created page AD Configuration required for various Windows RDSH or Desktop pools (Created page with "Home > VMWare platform > VMWare Horizon > AD Configuration required for various Windows RDSH or Desktop pools For users to be able to remotely login into the VMs created as part of Horizon, we need to create following OUs, groups and policies: # Open Active Directory users and computers ## Create OU for VDI ## Create new sub=OU for VMs ## Create group for Desktop pool users under main VDI OU. If you are planning to create five different VDI po...")
- 02:47, 20 May 2022 Saurabh talk contribs created page Horizon Connection server installation (Created page with "Home > VMWare platform > VMWare Horizon > Horizon Connection server installation =Pre-requisites= Before setting up a Horizon connection server we should have: # Working VMWare ESXi and vCenter setup with shared storage and adequate spare hardware resources (RAM, Disk, CPU, etc.) # Working AD server along with domain administration access to AD server #: Domain AD credentials should be available as a service account without any password expiry....")
- 02:27, 20 May 2022 Saurabh talk contribs created page ESXi boot issues (Created page with "Home > VMWare platform > VMWare vSphere or ESXi > ESXi boot issues It is possible for ESXi to not boot properly with errors such as: <pre> SINIT Authenticated Code Module detected an intel Trusted Execution Technology(TXT) problem at boot. </pre> These are caused due to TPM module. Clearing TPM module or resetting (Restarting) iDRAC does not seems to help. In such cases we need to do a cold reboot (Full poweroff and then after waiting sometim...")
- 05:08, 19 May 2022 Saurabh talk contribs created page Restart rsync on failure via shell script (Created page with "Home > Shell scripting > Useful bash shell scripts > Restart rsync on failure via shell script It is possible to create shell script to restart rsync, if it exits with failure status (non-zero return value) using: <pre> #!/bin/bash while [ 1 ] do <rsync-command> if [ "$?" = "0" ] ; then echo "rsync completed normally" exit else echo "Rsync failed. Retrying..." sleep 180 fi done </pre> Here replac...")
- 15:24, 16 May 2022 Saurabh talk contribs created page Test connectivity when using multiple tcp/ip stacks (Created page with "Home > VMWare platform > VMWare vSphere or ESXi > Test connectivity when using multiple tcp/ip stacks It is possible for ESXi host to use multiple TCP/IP stacks. In that case to validate connectivity between two ESXi hosts use: # Get list of network stacks using: #:<pre> #:: esxcli network ip netstack list #:</pre> # Understand which vmkernel port is using which TCP/IP stack using: #:<pre> #:: esxcli network ip interface list | grep -i 'name\...")
- 15:21, 16 May 2022 Saurabh talk contribs created page Troubleshooting vSAN issues (Created page with "Home > VMWare platform > vMWare VSAN > Troubleshooting vSAN issues =Host cannot communicate with one or more other nodes in the vSAN enabled cluster= There can be possibility of error such as: <pre> Host cannot communicate with one or more other nodes in the vSAN enabled cluster </pre> esp. after some kind of network disconnection OR incorrect shutdown / boot procedure. To solve that: # ping from one host to all other hosts and va...")
- 17:58, 15 May 2022 Saurabh talk contribs created page CentOS 8.x Control Web panel Whitelist or Blacklist IP or email or domain in postfix (Created page with "Home > CentOS > CentOS 8.x > CentOS 8.x email servers > CentOS 8.x Control Web panel > Whitelist or Blacklist IP or email or domain in postfix Normally logwatch emails might be sent to root@localhost and via /etc/aliases and combination of CentOS 8.x postfix send email through relay or smarthost with smtp authentication might get delivered to intend...")
- 17:54, 15 May 2022 Saurabh talk contribs created page CentOS 8.x Control Web panel Migrate web and email domain from existing server (Created page with "Home > CentOS > CentOS 8.x > CentOS 8.x email servers > CentOS 8.x Control Web panel > Migrate web and email domain from existing server Control Web Panel (CWP) is suited for email and web virtual hosting. Creating a greenfield domain should be straight forward. However, if you want to migrate existing site and emails to CWP based server use following steps...")
- 17:48, 15 May 2022 Saurabh talk contribs created page CentOS 8.x Control Web panel Initial configuration (Created page with "Home > CentOS > CentOS 8.x > CentOS 8.x email servers > CentOS 8.x Control Web panel > Initial configuration Once installed initial configuration of CWP can be done as follows: # After Web login on https://<server-fqdn-or-ip>:2031/, click "Set Root Email" and update "Admin Email" #: Ideally also select "Forward server system emails" checkbox # If you are planning to host emails th...")
- 17:43, 15 May 2022 Saurabh talk contribs created page CentOS 8.x Control Web panel Installation on linode (Created page with "Home > CentOS > CentOS 8.x > CentOS 8.x email servers > CentOS 8.x Control Web panel > Installation on linode To use Control Web panel (CWP) on CentOS8-Stream linode use: # Create a linode with CentOS8-Stream OS with at least 2 GB RAM. #: Ideally setup public key based access #: Configure a root password also. This is required later to login into CWP. # SSH to linode as root user an...")
- 17:41, 15 May 2022 Saurabh talk contribs created page CentOS 8.x Control Web panel (Created page with "Home > CentOS > CentOS 8.x > CentOS 8.x email servers > CentOS 8.x Control Web panel *CentOS 8.x Control Web panel Installation on linode *CentOS 8.x Control Web panel initial configuratoin *CentOS 8.x Control Web panel Migrate web and email domain from existing server *CentOS 8.x Control Web panel Whitelist or Blacklist IP or email or domain in postfix")
- 08:57, 15 May 2022 Saurabh talk contribs created page CentOS 8.x mediawiki include multi-line source code (Created page with "Home > CentOS > CentOS 8.x > Web based tools > mediawiki > CentOS 8.x mediawiki include multi-line source code It is often required to have source included as part of article within numbered text such as done at CentOS 8.x Systemd based reverse ssh tunnel service For that we need to use something like: <pre> # First # Second <source line lang="CSharp">Some Multi Line C Sharp Code </so...")
- 08:52, 15 May 2022 Saurabh talk contribs created page CentOS 8.x Systemd based reverse ssh tunnel service (Created page with "Home > CentOS > CentOS 8.x > CentOS 8.x Security tools > CentOS 8.x Systemd based reverse ssh tunnel service In case anydesk/teamviewer are proving unreliable there is option to connect to an internal server behind NAT using reverse ssh. For this we create service on internal server which does SSH to a public server via public key and creates reverse ssh tunnel from public server to itself. Anyone who has SSH access to public server, ca...")
- 17:26, 13 May 2022 Saurabh talk contribs created page ESXi losses all vmkernel or ip configuration (Created page with "Home > VMWare platform > VMWare vSphere or ESXi > ESXi losses all vmkernel or ip configuration While changing vMkernel IPs on very slow VPN connecting using vCenter web interface, had to refresh a browser a few times. After that ESXi seems to have lost all its configuration. Rebooting it also did not help. It was connected to vCenter, showing as part of distributed switch but all vMkernel adapters were not visible. To solve this restored ES...")
- 14:40, 13 May 2022 Saurabh talk contribs created page Get Dell OS 10 switch service tag using cli (Created page with "Home > Switch configuration notes > Get Dell OS 10 switch service tag using cli To get OS 10 switch service tag use: <pre> show inventory </pre> Refer: * https://www.dell.com/support/kbdoc/en-us/000187055/dell-emc-networking-how-to-find-the-service-tag-in-a-s6100-on-switch Home > Switch configuration notes > Get Dell OS 10 switch service tag using cli")
- 14:14, 13 May 2022 Saurabh talk contribs created page Breaking 40G QSFP+ to 4x10G SFP+ in Dell OS 10 switches (Created page with "Home > Switch configuration notes > Breaking 40G QSFP+ to 4x10G SFP+ in Dell OS 10 switches In OS 10 switches to convert a 40/100G port to 4x10G SFP+ when connected using 40G to 4x10G DAC cable use: <pre> config t interface breakout <interface> map 10g-4x </pre> where <interface> should be replaced with number such as 1/1/15 Refer: * https://dl.dell.com/topicspdf/smrtfab-os10-5-2_ug_en-us_en-us.pdf '''Note: ''' There is also mention...")
- 13:59, 13 May 2022 Saurabh talk contribs created page CentOS 8.x create or extend lvm partition with striping (Created page with "Home > CentOS > CentOS 8.x > System Administration > Filesystem management > CentOS 8.x create or extend lvm partition with striping =Create striped lvm partition= In case of physical disks (not in case of central storage where LUNs are coming from same pool), we can increase performance of a partition by doing striping (RAID 0) over various independent disks. To config...")
- 09:58, 11 May 2022 Saurabh talk contribs created page CentOS 7.x Rocks cluster 7.0 Update master and all compute nodes (Created page with "Home > CentOS > CentOS 7.x > CentOS 7.x Rocks cluster 7.0 > CentOS 7.x Rocks cluster 7.0 Update master and all compute nodes =Update master= To update use: # Edit files in '<tt>/etc/yum.repos.d/</tt>' and set enable=1. At least enabled repositories in: #* CentOS-Base.repo #* epel.repo #* rpmforge.repo # '''Ensure that''' in /etc/yum.conf, caching is enabled: #:<pre> #:: keepcache=1 #:</pre> # Then update the master node fully using: #:<pr...")
- 08:33, 11 May 2022 Saurabh talk contribs moved page CentOS 7.x Rocks cluster 7.0 Sun Grid Engine sge role to CentOS 7.x Rocks cluster 7.0 Son of Grid Engine sge role (Corrected name)
- 08:02, 11 May 2022 Saurabh talk contribs created page CentOS 7.x Rocks cluster 7.0 Sun Grid Engine sge role (Created page with "Home > CentOS > CentOS 7.x > CentOS 7.x Rocks cluster 7.0 > CentOS 7.x Rocks cluster 7.0 Sun Grid Engine sge role =Manager privielges= For a user to submit job with positive priority they must be manager as per SGE. To configure user as manager use: <pre> qconf -am <username> </pre> Refer: * https://docs.oracle.com/cd/E19957-01/820-0698/6ncdvjclp/index.html =Opening qmon= There is graphical qmon tool that comes with SGE. That does not...")
- 07:14, 11 May 2022 Saurabh talk contribs created page CentOS 7.x Rocks cluster 7.0 Compute node network configuration (Created page with "Home > CentOS > CentOS 7.x > CentOS 7.x Rocks cluster 7.0 > CentOS 7.x Rocks cluster 7.0 Compute node network configuration =Add public network to compute node= We can see defined networks using: <pre> rocks list network </pre> Then we can see list of existing host interfaces using: <pre> rocks list host interface <hostname> </pre> We can see additional ports on host using: <pre> ssh <hostname> "ip addr show" | grep mtu </pre> Then we ca...")
- 07:11, 11 May 2022 Saurabh talk contribs created page CentOS 7.x Rocks cluster 7.0 Reinstall OS on compute node (Created page with "Home > CentOS > CentOS 7.x > CentOS 7.x Rocks cluster 7.0 > CentOS 7.x Rocks cluster 7.0 Reinstall OS on compute node To reinstall OS on compute node use: <pre> rocks list host boot rocks set host boot <hostname> action=install ssh <hostname> "shutdown -r now" </pre> This assumes that the boot order on compute node is properly set to boot from network. '''By default there is /state/partition1 partition created on compute nodes. This part...")
- 07:04, 11 May 2022 Saurabh talk contribs created page CentOS 7.x Rocks cluster 7.0 Customize compute node during installation (Created page with "Home > CentOS > CentOS 7.x > CentOS 7.x Rocks cluster 7.0 > CentOS 7.x Rocks cluster 7.0 Customize compute node during installation To customer compute node immediately after the OS installer completes use following steps: # Create extend-compute.xml file using: #:<pre> #:: cd /export/rocks/install/site-profiles/7.0/nodes/ #:: cp -i skeleton.xml extend-compute.xml #Dont overwrite existing file, if any #:</pre> # Edit '<tt>extend-compute.x...")
- 06:42, 11 May 2022 Saurabh talk contribs created page CentOS 7.x Rocks cluster 7.0 Install rpm package in compute nodes (Created page with "Home > CentOS > CentOS 7.x > CentOS 7.x Rocks cluster 7.0 > CentOS 7.x Rocks cluster 7.0 Install rpm package in compute nodes =Install rpm package directly via yum/rpm= We can copy the rpm file to compute node and install it via rpm/yum. If the package is likely to be there in the yum repository of rocks then it call also be installed via yum directly. For example: <pre> ssh <compute-node-hostname> yum -y install iotop </pre> =Install...")
- 16:15, 10 May 2022 Saurabh talk contribs created page CentOS 7.x Rocks cluster 7.0 Troubleshooting (Created page with "Home > CentOS > CentOS 7.x > CentOS 7.x Rocks cluster 7.0 > CentOS 7.x Rocks cluster 7.0 Troubleshooting =Unable to use rocks command or sun-grid-engine= If while using rocks you face errors such as: <pre> [root@rocks ~]# rocks sync host network gpu error: commlib error: got select error (Connection refused) unable to send message to qmaster using port 536 on host "rocks.local": got send error [root@rocks ~]# qhost error: commlib error: got...")
- 12:46, 10 May 2022 Saurabh talk contribs created page CentOS 7.x Rocks cluster 7.0 Build compute server (Created page with "Home > CentOS > CentOS 7.x > CentOS 7.x Rocks cluster 7.0 > CentOS 7.x Rocks cluster 7.0 Build compute server The compute node is setup via Pxeboot. It should be connected only to private network and then booted via network. # Before doing network boot on compute node, on master server, run below command: #: <pre> #:: insert-ethers #: </pre> # On the ncurses based popup '''Choose Compute''', it would display: 'insert-ethers is waiting f...")
- 12:42, 10 May 2022 Saurabh talk contribs created page CentOS 7.x Rocks cluster 7.0 Build master server (Created page with "Home > CentOS > CentOS 7.x > CentOS 7.x Rocks cluster 7.0 > CentOS 7.x Rocks cluster 7.0 Build master server =Minimum requirement= * Should have atleast two network interfaces ** eth0 - First interface connected to private network ** eth1 - Second interface connected to public network * Hostname must set while installing. This FQDN should resolve to master node public IP via DNS. *: '''The hostname cannot be frontend.<domain-name>. Any ot...")
- 12:31, 10 May 2022 Saurabh talk contribs created page CentOS 7.x Rocks cluster 7.0 Build rolls server (Created page with "Home > CentOS > CentOS 7.x > CentOS 7.x Rocks cluster 7.0 > CentOS 7.x Rocks cluster 7.0 Build rolls server We can build a rolls server to setup master node using a CentOS 7 machine. To setup rolls on a CentOS 7 machine use: # Disable firewalld #:<pre> #:: systemctl stop firewalld #:: systemctl disable firewalld #:</pre> # Disable selinux by editing '<tt>/etc/selinux/config</tt>' as: #:<pre> #:: SELINUX=disabled #:</pre> #: Also run #::...")
- 12:20, 10 May 2022 Saurabh talk contribs created page CentOS 7.x Rocks cluster 7.0 Introduction (Created page with "Home > CentOS > CentOS 7.x > CentOS 7.x Rocks cluster 7.0 > CentOS 7.x Rocks cluster 7.0 Introduction =Types of nodes= Rocks cluster ( http://www.rocksclusters.org/ ) allows us to build a cluster of machines so that they can be used for HPC purposes. In this case we have at least three types of nodes: ; Rolls-server : This is setup initially to setup a master server. After master server is setup this may not be required ; Master-server :...")
- 12:10, 10 May 2022 Saurabh talk contribs created page CentOS 7.x Rocks cluster 7.0 (Created page with "Home > CentOS > CentOS 7.x > CentOS 7.x Rocks cluster 7.0 *CentOS 7.x Rocks cluster 7.0 Introduction *CentOS 7.x Rocks cluster 7.0 Build rolls server *CentOS 7.x Rocks cluster 7.0 Build master server *CentOS 7.x Rocks cluster 7.0 Build compute server")
- 11:57, 10 May 2022 Saurabh talk contribs created page Windows Server 2019 password reset (Created page with "Home > Windows > Windows Server 2019 > Windows Server 2019 password reset To reset password in Windows Server 2019 machine use: # Boot using Windows 2019 installation DVD # After your computer boots from the disc, select your language and keyboard and then Next. # Select Repair your computer at the lower left corner. # Select Troubleshoot and then choose Command Prompt. # Execute the following two commands, and press Enter after each. #:<pre>...")
- 11:54, 10 May 2022 Saurabh talk contribs created page Windows Server 2019 (Created page with "Home > Windows > Windows Server 2019 *Windows Server 2019 password reset")
- 06:16, 10 May 2022 Saurabh talk contribs created page Build VxRail 7.0 (Created page with "Home > VMWare platform > VxRail > Build VxRail 7.0 =Required VLANs= For building a VxRail cluster we need to have following VLANs: ; VLAN 3939 : This is used by VxRail nodes to communicate (discover) with each other. This is often referred as internal management VLAN. We should enable IGMP and IPv6 at least for this VLAN *: See Build_VxRail_4.7#Enabling_IPv6_and_IGMP_snooping ; VLAN for vSAN : For vSAN connectivity ; VLAN for vMotion : Fo...")
- 13:34, 21 April 2022 Saurabh talk contribs created page CentOS 8.x IPv6: MLD: clamping QRV from 1 to 2! messages in syslog (Created page with "Home > CentOS > CentOS 8.x > System Administration > [[Home > CentOS > CentOS 8.x > System Administration] It is possible to continous messages such as: <pre> IPv6: MLD: clamping QRV from 1 to 2! </pre> in '<tt>/var/log/syslog</tt>' file. To disable them for current boot use: <pre> sysctl net.ipv6.mld_qrv=1 </pre> To disable them even after reboots c...")
- 12:47, 19 April 2022 Saurabh talk contribs created page Production deployment for vCF 4.3.1.0 (Created page with "Home > VMWare platform > vCloud Foundation > Production deployment for vCF 4.3.1.0 =Site readiness= For vCF 4.3.1.0 deployment we need to ensure following before we start deployment: * We need one ESXi host to deploy cloud builder appliance. At least 4vCPU, 8GB Memory, 300GB storage is required for vCF cloud builder VM * Download the appropriate version of cloud builder appliance '''for exact same version''' and keep it read...")
- 07:22, 19 April 2022 Saurabh talk contribs created page Configuring new S4100 series Dell switch with OS 10 (Created page with "Home > Switch configuration notes > Configuring new S4100 series Dell switch with OS 10 To configure a new S4100 series switch (Ex S4128F-on) we can use below details: =Default baud-rate for console= The first option to get connected to a new switch is via console. For Dell switches while using the micro-usb port present on the switch, connect via Putty or hyperterminal with baud rate: '''115200 baud rate, 8 data bits, and no parity. ''' =Defa...")
- 07:00, 19 April 2022 Saurabh talk contribs created page Upgrading firwmare on S4100 series Dell switches with OS 10 (Created page with "Home > Switch configuration notes > Upgrading firwmare on S4100 series Dell switches with OS 10 To perform OS10 upgrade using CLI use below steps: # For download the appropriate image for the switch using Dell Digit locker ( https://www.dell.com/SUPPORT/SOFTWARE/ ) # Download OS10 Enterprise Edition image, from the site in tar file format for the upgrade. # Take configuration backup of current running config from exec mode #:<pre> #:: copy running-...")
- 04:38, 19 April 2022 Saurabh talk contribs created page CentOS 8.x System Activity Reporter (sar) (Created page with "Home > CentOS > CentOS 8.x > System Administration > System Activity Reporter (sar) =Install sar= To install sar use: <pre> dnf -y install sysstat </pre> Start and enable sysstat service: <pre> systemctl start sysstat systemctl enable sysstat </pre> =Get history= ==CPU usage history== To get CPU usage history use: <pre> sar -u </pre> ==Ram usage history== To...")
- 03:40, 19 April 2022 Saurabh talk contribs created page Yaws (Created page with "Home > Erlang > Yaws *CentOS 8.x Create systemd service for erlang yaws web server")
- 04:14, 14 April 2022 Saurabh talk contribs created page CentOS 8.x dnsmasq (Created page with "Home > CentOS > CentOS 8.x > DNS servers > dnsmasq If we do not want to setup full fledged DNS using bind and only need a few A/MX records resolved, similar to /etc/hosts file then we can use dnsmasq. dnsmasq is often automatically deployed and used by libvirt. If KVM based virtualization is being used there might be dnsmasq already listening on default virbr0 - 192.168.122.1 on UDP Port 53. If w...")
- 04:02, 14 April 2022 Saurabh talk contribs created page CentOS 8.x DNS servers (Created page with "Home > CentOS > CentOS 8.x > DNS servers *CentOS 8.x dnsmasq '''There are older articles on bind at: *Bind DNS server configuration *CentOS 7.x DNS configuration")
- 06:54, 13 April 2022 Saurabh talk contribs created page Enable Suse for SAP software management via Local CD/DVD (Created page with "Home > Suse > SAP setup and maintenance > Enable Suse for SAP software management via Local CD/DVD After Suse for SAP (eg SLES 15 for SAP) installation, if we go to yast2 -> Software Repositories, most of the repositories refer to virtual CD or local iso file in /sapmnt folder. To make the installation files avaialble, via iDRAC mount the ISO file used to install Suse in virtual CD drive. Then copy the installation ISO to /sapmnt folder. We...")
- 06:03, 13 April 2022 Saurabh talk contribs created page Sophos XG series VPN configuration (Created page with "Home > Enterprise security devices or applications > Sophos Firewall or IPS > Sophos XG series VPN configuration In case of Sophos firewall we can configure VPN as follows: # Go to VPN -> "Show VPN Settings" and configure the LAN IPs (VPN IPs) to be allotted to users once they are connected over VPN. These are typically a small subnet (eg /24) from 10.0.0.0/8 (Preferable), 172.16.0.0/12 or 192.168.0.0/16. #: Avoiding 192.168.0.0/16 makes sense...")
- 13:55, 7 April 2022 Saurabh talk contribs moved page Installaing Android SDK to Installing Android SDK (Spelling correction)
- 04:40, 6 April 2022 Saurabh talk contribs created page SAP server maintenance overview (Created page with "Home > Suse > SAP setup and maintenance > SAP server maintenance overview =Scheduled maintenance= Following different scenarios are possible for base IT infrastructure maintenance for SAP servers: ; Only App and DB software maintenace : In this case we can stop or start SAP cluster using Pacemaker start and stop for Hana DB and application servers ; Entire power servers and LPARs need to be powered off and on : In this case we can follow th...")
- 03:39, 30 March 2022 Saurabh talk contribs created page CentOS 8.x Zimbra forward a copy of all incoming and outgoing emails to audit email ID (Created page with "Home > CentOS > CentOS 8.x > CentOS 8.x email servers > CentOS 8.x Zimbra > CentOS 8.x Zimbra forward a copy of all incoming and outgoing emails to audit email ID For auditing or security compliance purposes, it might be required to forward a copy of all incoming / outgoing emails to a particular audit email ID. To configure such forwarding use below steps: # Create '<tt>/opt/zimbra/conf/sender_bcc</tt>' with domains and email ID list...")