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MID Server Health, Upgrades and Operations

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In this lesson, you will learn:

  • How to see MID Server health
  • How MID Servers upgrade
  • What to check every day

🔁 Quick look back: Last time: Hardening the MID Server. You learned how SNWR hardened its MID Server hosts.

1 The Problem: A MID Server Goes Down and Nobody Notices

On past projects, a MID Server went down on a Friday. Nobody looked until Wednesday. By then:

  • Four nightly scans had failed.
  • The data was days old.

🎯 The problem: A MID Server can go down without anyone noticing.

👉 The fix: Watch MID health every day, and know how upgrades work.

Table of daily MID checks.
Figure 1. Daily MID Server checks for SNWR.

2 Health

  • The MID Server list shows status, version and last contact.
  • Dashboards show memory, CPU and jobs.
  • Alerts can tell the team when a MID goes Down.

3 Upgrades

When the instance is upgraded, MID Servers upgrade themselves to match. Usually this just works.

⚠️ Heads up: If a MID Server can’t upgrade, for example because of disk space or a proxy, it may stop working. Check all MID Servers after every instance upgrade.

4 Project Clear View: How We Implemented It

📍 Situation: Hana’s team will run the MID Servers after handover.

🧭 Decision: Set up daily checks and an alert for MID Servers going Down.

🛠️ Steps we took:

  1. Added the five daily checks to the runbook.
  2. Set up an email alert to SNWR Discovery Admins when a MID goes Down.
  3. Wrote ‘check all MID Servers’ into the instance upgrade plan.
  4. Walked Hana’s team through the checks.

✅ What we verified:

  • Hana’s team ran the checks without help.
  • A test alert reached the team.

📁 Evidence: Daily MID checks in the runbook (see Operations Handover › Writing the Operations Runbook).

5 Quick recap

  • Check MID status, validation, version, resources and jobs every day.
  • MID Servers upgrade themselves after the instance.
  • Check all MID Servers after every upgrade.
  • Alert the team when a MID goes Down.

6 Check yourself

Think of your answer first. Then tap to check.

1 What happens to MID Servers when the instance is upgraded? Show answer

They upgrade themselves to match.

2 Name three daily MID checks. Show answer

Any three of: status, validated, version, memory and CPU, last night’s jobs.

3 Who gets the alert at SNWR? Show answer

SNWR Discovery Admins.

Nice work! SNWR’s MID Servers are watched every day. 🎉
Next up: How Discovery Selects and Uses Credentials

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