The Problem mount.nfs4: Failed to resolve server fs-d3d54350.efs.us-east-1.amazonaws.com: Name or service not known or: ping: unknown host fs-d3d54350.efs.us-east-1.amazonaws.com The Solution 1. Open the Amazon VPC console. 2. Select the VPC. 3. Review the information in the Description tab. In this example, both settings are enabled. DNS resolution Enabled DNS hostnames Enabled 4. To update these […]
Archives for March 2022
How to take mailbox backup of Zimbra Account from CLI
A system administrator’s worst nightmare is the call, page, text message, or any other alarm informing you that the server is down. Especially when the server is very critical and instrumental to the organization, like a Zimbra Mail Server. This post discusses the backup and restores procedure of a Zimbra Account. Mailbox backup from CLI […]
How to Disable/Enable services in Zimbra Mail Server
Zimbra provides open-source server and client software for numerous applications like messaging and collaboration: email, group calendaring, contacts, and web document management and authoring.The Zimbra server has been made available for various platforms like Linux, Mac OS X, appliances, and virtualization platforms. The Zimbra Web 2.0 Ajax client runs on the most commonly used browsers […]
How to Lock and Unlock Zimbra Accounts from Command Line
There are 5 states of any Zimbra account as explained below. We can use the zmprov command to change the status of an account. Active: Active is the normal status for a mailbox account. Mail is delivered and users can log into the client interface. Maintenance: When a mailbox status is maintenance, login is disabled […]
How to Manage Zimbra Account Status from CLI
There are 5 states of any Zimbra account as explained below. We can use the zmprov command to change the status of an account. Active: Active is the normal status for a mailbox account. Mail is delivered and users can log into the client interface. Maintenance: When a mailbox status is maintenance, login is disabled […]
How to move /usr and /var to Another Partition or Disk
Some simple steps can help protect data and the integrity of the installed Oracle Linux Operating System. First, use separate disk partitions for operating system and user data (that is, separate partitions for /home, /tmp, /var/tmp, /oracle, and so on). This strategy can prevent a “file system full” issue from impacting operations. Establishing disk quotas […]
dstat Command Examples in Linux
The dstat application is not commonly installed. It will need to be installed with your package manager. It requires Python 2.2 and above, which is installed by default on modern Linux systems: # apt-get install dstat # yum install dstat The dstat application displays disk, network, memory usage, and running task information at regular intervals. […]
How to move /var on a separate disk as a separate mount point (Online)
By default when you install any Linux system, the /var directory is created automatically under the root partition(‘/’). In some situations, you might want to separate out the /var directory on a different mount point or partition altogether. Especially when you want to manage it independently and have a large amount of data to be […]
How to Stop and Start Ec2 instance using Jenkins
Jenkins is an open-source Continuous Integration tool. However, it’s not limited to Continuous Integration alone. Jenkins is supported by a large number of plugins that enhance its capability. The Jenkins tool is written in Java and so are its plugins. The tool has a minimalistic GUI that can be improved using specific plugins if required. […]
Search XML Attributes PowerShell XPath
Extensible Markup Language (XML) is a plain text format that is used to store structured data. XML is written to be both human and machine-readable. XML documents often begin with a declaration, as shown here: <?xml version=”1.0″ encoding=”utf-8″?> The Select-Xml command may be used to search XML documents using the XPath query language. PowerShell v3 […]