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Finding Malware Persistence in Linux: How a Cron Job Kept Reinfecting Our Zimbra Server
Killing a malicious process does not necessarily remove malware from a Linux server. We learned this…
Read MoreFinding Malware Persistence in Linux: How a Cron Job Kept Reinfecting Our Zimbra Server
How We Investigated a Compromised Zimbra Mail Server on Ubuntu
Running your own mail server means that when something goes wrong, you sometimes need to investigate…
How to Upgrade Ubuntu 22.04 to 24.04 on DigitalOcean When Repository Errors Block the Upgrade
Upgrading an Ubuntu server from 22.04 LTS to 24.04 LTS is normally straightforward using do-release-upgrade. However,…
Keeping DNS Answers Fast While Updating Routing Policy
DNS steering systems change over time. Operators add new endpoints. Health state changes. A new region…
Building A Runtime Snapshot For Fast Authoritative DNS Decisions
Authoritative DNS must answer quickly. When a recursive resolver asks for a DNS record, the authoritative…
Health Checks In DNS Steering: From Origin Status To Answer Policy
DNS steering should not return an endpoint only because it is nearby. It should not return…
Designing Fallback Logic For Reliable DNS Steering
DNS steering is useful when the system has enough information to choose a good answer. But…
Centralized Authentication and Home Directories with UCS, LDAP, and NFS
In Part 2, we built the LTSP server for PXE boot thin clients on Ubuntu 24.04.…
Pax Silica and the Philippines: Development Should Come With Conditions, Not Automatic Rejection
The Philippines has long looked at countries such as Singapore and asked a familiar question: Why…
EDNS Client Subnet: Powerful Signal Or Operational Trap?
DNS steering depends on signals. The better the signal, the better the routing decision can be.…
