Install and Configure NTP server for time adjustment in RHEL/Centos

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### Install NTPd. [root@testos ~]# yum -y install ntp ### Edit/Update NTP Configuration file [root@testos ~]# vi /etc/ntp.conf ### line 18: add the network range you allow to receive requests restrict 10.0.0.0 mask 255.255.255.0 nomodify notrap ### change servers for synchronization ### change servers for synchronization #server 0.centos.pool.ntp.org iburst #server 1.centos.pool.ntp.org iburst #server 2.centos.pool.ntp.org iburst … Read more

Disable Automatic Server Recovery (ASR) in HPE ProLiant Servers

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Automatic Server Recovery (ASR) is configured using RBSU available during the initial boot of the server by pressing the F9 key when prompted. The Server Availability menu in RBSU includes options that configure the ASR features: • ASR Status • ASR Timeout ASR Status The ASR Status option is a toggle setting that either enables … Read more

Public Yum Server for Oracle Linux 6,7

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There is no yum repository in Oracle Linux after installation, so it’s necessary to set it in order to update the system with yum command. Oracle provides public yum server and we can use it for free to set. ⇒ Public Yum Server : http://public-yum.oracle.com/ ### Download repository file [root@testos ~]# cd /etc/yum.repos.d/ ### Oracle … Read more

Redhat – What is open source?

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Overview Open source is a term that originally referred to open source software (OSS). Open source software is code that is designed to be publicly accessible—anyone can see, modify, and distribute the code as they see fit. Open source software is developed in a decentralized and collaborative way, relying on peer review and community production. … Read more

Adjusting VMware ESX host Time Zone(and DST)

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Details: During installation, a time zone was selected for an ESX host that does not match the desired time zone. This article provides steps to change the time zone or daylight-saving. Note: An ESX host with an incorrect date and time or time zone passes on that incorrect information. When a virtual machine boots up … Read more

Convert the dmesg timestamps to human-readable format on Linux

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The dmesg results from newer Linux kernels show the timestamps. the dmesg timestamp is the time in seconds since the kernel starting time. [root@unixonline]# dmesg [2593404.865599] vmxnet3 0000:0b:00.0 ens192: intr type 3, mode 0, 5 vectors allocated [2593404.868590] vmxnet3 0000:0b:00.0 ens192: NIC Link is Up 10000 Mbps [2593426.220166] vmxnet3 0000:0b:00.0 ens192: intr type 3, mode … Read more

MySQL Server Time Zone Support

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This article describes the time zone settings maintained by MySQL, how to load the system tables required for named time support, how to stay current with time zone changes, and how to enable leap-second support. Beginning with MySQL 8.0, time zone offsets are also supported for inserted datetime values; see “The DATE, DATETIME, and TIMESTAMP Types”, … Read more

Configure Static IP Address on Solaris11

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//Check current ip configuration status # dladm show-phys # ipadm show-if # ipadm show-addr //Check the interfaces name # dladm show-phys — output Example —LINK MEDIA STATE SPEED DUPLEX DEVICEnet0 Ethernet up 1000 full e1000g0 –> Attentiom to this linenet1 Ethernet unknown 0 unknown pcn0 =============================================================================================== # ipadm create-ip net0 //Check status # ipadm show-if … Read more

Generate Random Password in Linux and Solaris CLI (pwgen)

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According to pwgen man page, “the pwgen program generates passwords which are designed to be easily memorized by humans, while being as secure as possible.” It returns multiple password options that meet the criteria you provide so that you can select the one that you prefer. ### Install pwgen On RHEL/CentOS Linux, you can install … Read more