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strongSwan IKEv2 Site-to-Site VPN with swanctl

strongSwan IKEv2 Site-to-Site VPN with swanctl

Build an IKEv2 site-to-site tunnel with strongSwan and swanctl: certificates, connections, child SAs with traffic selectors, and the commands to verif

admin admin 2026-09-17
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DRBD 9 Setup: Resources, Promotion and Quorum

DRBD 9 Setup: Resources, Promotion and Quorum

Set up DRBD 9 replication: resource files, drbdadm create-md and up, the first full sync, promotion, quorum options and split-brain recovery after a f

admin admin 2026-09-17
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Docker Compose Startup Order and Healthchecks

Docker Compose Startup Order and Healthchecks

Why depends_on starts containers too early, how to gate startup on healthchecks with condition service_healthy, and how restart: true keeps ordering h

admin admin 2026-09-17
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Argo CD App-of-Apps with Sync Waves

Argo CD App-of-Apps with Sync Waves

Bootstrap Kubernetes clusters with the Argo CD app-of-apps pattern: sync-wave ordering for CRDs and operators, ApplicationSets for fleets, and drift c

admin admin 2026-09-17
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Velero Kubernetes Backup and Restore: How It Works

Velero Kubernetes Backup and Restore: How It Works

Velero backup, schedule and restore workflows for Kubernetes: CRDs, object storage as source of truth, TTLs, namespace remapping and non-destructive r

admin admin 2026-09-17
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restic Backup Retention: forget, prune and S3 Repos

restic Backup Retention: forget, prune and S3 Repos

Design restic retention for S3-backed repositories: keep-daily/weekly/monthly policies, grouping safety, prune to reclaim space, and append-only cavea

admin admin 2026-09-17
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SELinux Denials: ausearch, sealert and audit2allow

SELinux Denials: ausearch, sealert and audit2allow

Fix SELinux denials the right way: triage with ausearch and sealert, check labels and booleans first, and only then build a local audit2allow policy m

admin admin 2026-09-17
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Linux SSSD Active Directory Join and Troubleshooting

Linux SSSD Active Directory Join and Troubleshooting

Join Linux hosts to Active Directory with realmd and SSSD, then fix the failures that break logins later: DNS, keytab, access provider and stale cache

admin admin 2026-09-17
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Linux chrony NTP Sync Troubleshooting with chronyc

Linux chrony NTP Sync Troubleshooting with chronyc

Diagnose clock sync on Linux with chronyc tracking, sources and sourcestats, fix a stepped clock with makestep, and harden chrony.conf for servers and

admin admin 2026-09-17
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BGP Graceful Shutdown: the GShut Community (RFC 8326)

BGP Graceful Shutdown: the GShut Community (RFC 8326)

Use the well-known GRACEFUL_SHUTDOWN community (65535:0) to drain BGP traffic before maintenance instead of blackholing it, with IOS XE and IOS XR exa

admin admin 2026-09-17
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