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Appendix

Lingering enabled Platforms

Distro family	Versions that do NOT support self-linger without root (default)	Versions that DO support self-linger without root (default)	Evidence
Ubuntu	16.04 (Xenial) ships systemd 229 → too old	18.04 (Bionic) ships systemd 237 → new enough (and later Ubuntu releases are newer still)	(Launchpad)
Red Hat Enterprise Linux	RHEL 7 ships systemd 219 → too old	RHEL 8 ships systemd 239; RHEL 9 rebased to 252	(Red Hat Customer Portal)
CentOS	CentOS 7 (EL7) ships systemd 219-series → too old	CentOS 8 (EL8) ships systemd 239; CentOS Stream 9 / EL9 family is systemd 252-series	(Red Hat Customer Portal)
Amazon Linux	Amazon Linux 2 uses systemd 219 → too old	Amazon Linux 2023 is systemd 252-series (example package version in the wild: 252.16-1.amzn2023…)	(AWS Documentation)

Quick verification commands

# 1) Check systemd major version (needs >= 230 for self-linger policy support)
systemctl --version

# 2) Confirm the polkit action exists (file is typically here)
grep -R "set-self-linger" /usr/share/polkit-1/actions/org.freedesktop.login1.policy

# 3) Test as the target user (no sudo)
loginctl enable-linger

FAQ

What is the java version required for vuAppagent?

The target server should have Java installed with a version greater than or equal to 1.8

What is the java version required for the VuhealthAgent?

The target server should have Java installed with a version greater than or equal to 1.8

What is the java version required for the vuLogAgent?

The target server should have Java installed with a version greater than or equal to 1.8

How to increase the maximum number of logbeat multiline configuration? The maximum number of lines that can be combined into one event is 500. If the multiline message contains more than 500 lines, any additional lines are discarded.

Set multiline.max_lines in the multiline configuration section of the logbeat configuration. Eg:

- multiline:
    type: pattern
    pattern: '^\['
    negate: true
    match: after
    max_lines: 1000

Or

multiline.type: pattern
multiline.pattern: '^\['
multiline.negate: true
multiline.match: after
multiline.max_lines: 1000

How to run commands or scripts and collect metrics using vuhealthagent?

# User Commands Metricset
- metricset: userCommands
  enabled: true
  metaFields:
  - doc_type: metricbeat
  - type: metric_type
  - tags: vuagent
  commands:
  - name: "name_of_the_command"
    cmd: "The command"
    collect_cmd_output: true
    fetchInterval: interval_in_seconds

Example:

# User Commands Metricset
- metricset: userCommands
  enabled: true
  metaFields:
  - doc_type: metricbeat
  - type: service_data_cmd
  - tags: vuagent
  commands:
  - name: "service_monitor"
    cmd: "bash /home/vunet/service_monitor.sh"
    collect_cmd_output: true
    fetchInterval: 20

How to check service availability using vuhealthagent?

# Service Availability (Service Heartbeat)  Metricset
- metricset: serviceAvailability
  enabled: true
  metaFields:
    - type: tcpping
    - doc_type: heartbeat
  fetchInterval: 120
  hosts:
  - \{HOST\}:\{PORT\}

Example:

# Service Availability (Service Heartbeat)  Metricset
- metricset: serviceAvailability
  enabled: true
  metaFields:
    - type: tcpping
    - doc_type: heartbeat
  fetchInterval: 120
  hosts:
  - qa.vunetsytems.in:9094