4 Systems & infrastructure
Every entry filed under Systems & infrastructure and its subtopics.
What kind of help
Works on
What do these mean?
- Beginner
- You are new to this topic.
- Intermediate
- You use it, and want to get better.
- Advanced
- You know it well and need the details.
- Guided project
- Build something small from start to finish, step by step.
- Explains an idea
- Plain words on how something works and why.
- Step by step
- Numbered steps to get one task done.
- Cheat sheet
- Commands and options in a table, to look up fast.
- Fixes an error
- An error message, what it means, and how to solve it.
8 entries match these filters
- 0347 Port check script: test a list of host:port pairs with timeouts A bash script that tries a TCP connection to each host:port you give it, waits a few seconds at most, and reports… Beginner · Cheat sheet · Linux, macOS Script DNS, IP addresses & ports · Firewalls 15 Oct 2026
- 0348 DNS check script: compare answers from several resolvers A bash script that looks up one or more names against your system resolver and three public resolvers, shows each answer with… Beginner · Cheat sheet · Linux, macOS Script DNS, IP addresses & ports 15 Oct 2026
- 0358 SSH server audit script: print risky sshd settings A read-only bash script that asks sshd for its effective configuration, compares the important settings with safe values, flags config.d files that… Intermediate · Cheat sheet · Linux Script Server hardening · SSH 15 Oct 2026
- 0168 Server health check script: disk, memory and failed units A dependency-free bash script that checks disk and inode usage, available memory, load, failed systemd units and pending reboots, and exits non-zero… Intermediate · Cheat sheet · Linux Script Disks, LVM & filesystems · Services & systemd 15 Oct 2026
- 0141 List Kubernetes pods that are not Running and Ready A bash script that lists every pod across namespaces that is Pending, failing or running but not ready, with the waiting reason,… Intermediate · Cheat sheet · Linux, macOS Script Troubleshooting 15 Oct 2026
- 0159 OpenShift cluster health snapshot: oc adm, nodes, MachineConfigPools and updates An admin overview of OpenShift day-2 checks (cluster version, update channels, cluster Operators, nodes, MachineConfigPools, must-gather) with a read-only bash script that… Advanced · Cheat sheet · Linux, macOS Script Cluster administration · Troubleshooting 15 Oct 2026
- 0108 List all Proxmox VE guests with status and locks (pvesh + jq) A Bash script that lists every VM and container in the cluster with node, status, lock, memory and uptime, using the Proxmox… Intermediate · Cheat sheet · Linux Script Shell scripting · VMs & containers 15 Oct 2026
- 0128 virsh status report: VMs, state, resources and IPs in one table A read-only bash script that prints a libvirt/KVM host report: virtual networks, storage pools, and every VM with its state, vCPUs, memory,… Intermediate · Cheat sheet · Linux Script Basics 15 Oct 2026