Linux

Linux OS Materials

Configure DHCP (Dynamic Host Configuration Protocol) Server in RHEL/Centos 7

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### Install DHCP Server [root@testos ~]# yum -y install dhcp ### Configure DHCP Server [root@testos ~]# vi /etc/dhcp/dhcpd.conf # create new # specify domain name option domain-name “unixtest.com”; # specify name server’s hostname or IP address option domain-name-servers testos.unixtest.com; # default lease time default-lease-time 600; # max lease time max-lease-time 7200; # this DHCP server … Read more

How to Set the JVM Time Zone

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In this tutorial, we’ll take a look at several ways we can modify the time zone of the JVM. Introduction to Time Zone By default, the JVM reads time zone information from the operating system. This information gets passed to the TimeZone class, which stores the time zone and calculates the daylight saving time. We can call the … Read more

How to change the timezone of containers running in k8s

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rm -rf /etc/localtime ln -s /usr/share/zoneinfo/Asia/Tehran /etc/localtime dpkg-reconfigure -f noninteractive tzdata 2. Change the timezone via k8s mount hostPath: spec: containers: – name: nginx image: nginx ports: – containerPort: 80 name: nginx volumeMounts: – name: tz-config mountPath: /etc/localtime volumes: – name: tz-config hostPath: path: /usr/share/zoneinfo/Asia/Tehran

Install NetBackup Client on Solaris / Linux

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Download / Untar NetBackup Client binary package and exec installation script: ### FYI, Just NetBackup master server hostname is required during installation. [root @ soltest]/tmp # tar -xf NetBackup_7.6.0.1_CLIENTS1.tar [root @ soltest]/tmp # cd NetBackup_7.6.0.1_CLIENTS1 [root @ soltest]/tmp/NetBackup_7.6.0.1_CLIENTS1 # ./install Symantec Installation Script Copyright 1993 – 2013 Symantec Corporation, All Rights Reserved. Installing NetBackup Client … Read more

How To Install and Configure DellEMC PowerPath on Linux (RHEL/CentOS)

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NOTICE: Before you start DellEMC powerpath installation and configuration, make sure HBA cards are installed on the server and Fiber channel switches are zoned properly. [root@unixonline ~]# tar -xzf DellEMCPower.LINUX-7.4.0.b201.tar.gz [root@unixonline ~]# ls DellEMCPower.LINUX-7.4.0.00.00-201.OL7.x86_64.rpm DellEMCPower.LINUX-7.4.0.00.00-201.RHEL8.x86_64.rpm DellEMCPower.LINUX-7.4.0.b201.tar.gz DellEMCPower.LINUX-7.4.0.00.00-201.OL8.x86_64.rpm DellEMCPower.LINUX-7.4.0.00.00-201.SLES12SP5.x86_64.rpm DellEMCPower.LINUX-7.4.0.00.00-201.RHEL7.x86_64.rpm DellEMCPower.LINUX-7.4.0.00.00-201.SLES15SP3.x86_64.rpm In this example, DellEMC Powerpath 7 ( DellEMCPower.LINUX-7.4.0.00.00-201.RHEL7.x86_64.rpm ) is installed on Red Hat 7. … Read more

Reset HBA port in Linux

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There are several commands available that allow you to reset one or more interconnects in Linux, issue_lip is one and the most recommended command. The following command can be used to find HBA device name.(in this example host1,host2): [root@unixonline ~]# systool -c fc_host -v|egrep “Device =|node_name|port_state|speed” Class Device = “host1” node_name = “0x20000032fff8dce3” port_state = … Read more

Monitoring Swap Usage for Each Process With the top Command

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To monitor which process is using swap, you can use the top command:Log in to Advanced shell (bash).Type the following command to enter the top utility: # top [root@unixonline]# top top – 01:10:24 up 230 days, 9:05, 9 users, load average: 0.00, 0.01, 0.05 Tasks: 220 total, 1 running, 219 sleeping, 0 stopped, 0 zombie … Read more