Freaks City

Development Environment Reference system used: Ubuntu 14.04.1 Desktop i386 VMware Workstation 10.0.2 Useful commands for environment verification: lsb_release -a # Check Ubuntu version cat /etc/issue # View Ubuntu version ctrl+alt+a # Open terminal du -sh [file/folder] # Check file or folder size su root # Switch to ...

Storage Configuration This deployment uses NFS for persistent storage. Ensure a StorageClass named nfs-storage is already configured in your cluster. Create Namespace kubectl create namespace ops Configure RBAC Permissions Define a service account, cluster role, and binding to grant Jenkins necessary permissions: # ServiceAccount apiVersion: ...

To isolate heartbeat traffic and avoid interference from production interfaces, static host routes are added for the dedicated interconnect (eth2). These persist across reboots: # On primary node (hostname: master) ip route add 10.20.23.111/32 dev eth2 echo "ip route add 10.20.23.111/32 dev eth2" >> /etc/rc.d/rc.local # On seco ...

Creating Symbolic Links To create a symbolic link directory /shared pointing to the source directory /data/shared, ensure there's no existing directory named "shared" in the root directory, then execute: ln -s /data/shared /shared Verify the link with: ll shared # Output: shared -> /data/shared Note: Configure firewall settings ...

Data Classification in Containerized Environments Container filesystems are inherently ephemeral. When a container crashes or is deleted, any changes made to its local storage are lost. To manage data effectively, we generally categorize container data into three types: Configuration Data: Initial settings or files required at startup. Transie ...

Note: The setup with CentOS 8 (kernel 4.18) is not viable. Switch the client and MDS to Ubuntu (tested successfully on Ubuntu 18.04 with kernel 4.15) while keeping the setup steps the same. With the rapid development of networking and parallel computing, file I/O has become a bottleneck for overall system performence. Traditional NFS versions f ...

RPCbind Service Failure on CentOS 7.4 Issue Summary After rebooting a virtual machine, NFS mounts configured in /etc/rc.local failed to execute properly. Root Cause Analysis The root cause was that the rpcbind service failed to start, which prevented NFS mounts from functioning. Attempting to restart the service reuslted in the following error: ...

NFS Server Setup Installing Required Packages yum install -y nfs-utils Configuring the Export File Edit the exports configuration file to define which dierctories to share: vim /etc/exports Add the following line to share /data/shared with the specified network: /data/shared 10.0.0.0/24(rw,sync,fsid=0) Configuration options explained: Opt ...

Configuring Local and Remote YUM Repositories Setting Up a Local Repository Using File Access Create a repository definition file pointing to a ISO mount point: cd /etc/yum.repos.d/ cat > local-repo.repo <<EOF [local-repo] name=Local Repository baseurl=file:///iso_mount enabled=1 gpgcheck=0 EOF mkdir -p /iso_mount mount /dev/cdrom /is ...

Configuring Yum Software RepositoriesYUM (Yellowdog Updater Modified) is a package management utility that simplifies the installation, updating, and removal of software packages on Linux distributions. By resolving dependencies automatically, it alleviates the need for manual administrative intervention when managing RPM packages. In environme ...