X.509 certificate

Plugin: go.d.plugin Module: x509check

Overview

This collectors monitors x509 certificates expiration time and revocation status.

This collector is supported on all platforms.

This collector supports collecting metrics from multiple instances of this integration, including remote instances.

Default Behavior

Auto-Detection

This integration doesn't support auto-detection.

Limits

The default configuration for this integration does not impose any limits on data collection.

Performance Impact

The default configuration for this integration is not expected to impose a significant performance impact on the system.

Metrics

Metrics grouped by scope.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.

Per source

These metrics refer to the SSL certificate.

Labels:

Label	Description
source	Same as the "source" configuration option.
common_name	The common name (CN) extracted from the certificate.
depth	The depth of the certificate within the certificate chain. The leaf certificate has a depth of 0, and subsequent certificates (intermediate certificates) have increasing depth values. The root certificate is at the highest depth.

Metrics:

Metric	Dimensions	Unit
x509check.time_until_expiration	expiry	seconds
x509check.revocation_status	not_revoked, revoked	boolean

Alerts

The following alerts are available:

Alert name	On metric	Description
x509check_days_until_expiration	x509check.time_until_expiration	SSL cert expiring soon (${label:source} cn:${label:common_name})
x509check_revocation_status	x509check.revocation_status	SSL cert revoked (${label:source})

Setup

Prerequisites

No action required.

Configuration

File

The configuration file name for this integration is go.d/x509check.conf.

The file format is YAML. Generally, the structure is:

update_every: 1
autodetection_retry: 0
jobs:
  - name: some_name1
  - name: some_name1

You can edit the configuration file using the edit-config script from the Netdata config directory.

cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config go.d/x509check.conf

Options

The following options can be defined globally: update_every, autodetection_retry.

Config options

Name	Description	Default	Required
update_every	Data collection frequency.	1	no
autodetection_retry	Recheck interval in seconds. Zero means no recheck will be scheduled.	0	no
source	Certificate source. Allowed schemes: https, tcp, tcp4, tcp6, udp, udp4, udp6, file, smtp.		no
check_full_chain	Monitor expiration time for all certificates in the SSL/TLS chain, including intermediate and root certificates.	no	no
check_revocation_status	Whether to check the revocation status of the certificate.	no	no
timeout	SSL connection timeout.	2	no
tls_skip_verify	Server certificate chain and hostname validation policy. Controls whether the client performs this check.	no	no
tls_ca	Certification authority that the client uses when verifying the server's certificates.		no
tls_cert	Client TLS certificate.		no
tls_key	Client TLS key.		no

Examples

Website certificate

Website certificate.

Config

jobs:
  - name: my_site_cert
    source: https://my_site.org:443

Local file certificate

Local file certificate.

Config

jobs:
  - name: my_file_cert
    source: file:///home/me/cert.pem

SMTP certificate

SMTP certificate.

Config

jobs:
  - name: my_smtp_cert
    source: smtp://smtp.my_mail.org:587

Multi-instance

Note: When you define more than one job, their names must be unique.

Check the expiration status of the multiple websites' certificates.

Config

jobs:
  - name: my_site_cert1
    source: https://my_site1.org:443

  - name: my_site_cert2
    source: https://my_site1.org:443

  - name: my_site_cert3
    source: https://my_site3.org:443

Troubleshooting

Debug Mode

Important: Debug mode is not supported for data collection jobs created via the UI using the Dyncfg feature.

To troubleshoot issues with the x509check collector, run the go.d.plugin with the debug option enabled. The output should give you clues as to why the collector isn't working.

• Navigate to the plugins.d directory, usually at /usr/libexec/netdata/plugins.d/. If that's not the case on your system, open netdata.conf and look for the plugins setting under [directories].

  cd /usr/libexec/netdata/plugins.d/

• Switch to the netdata user.

  sudo -u netdata -s

• Run the go.d.plugin to debug the collector:

  ./go.d.plugin -d -m x509check

Getting Logs

If you're encountering problems with the x509check collector, follow these steps to retrieve logs and identify potential issues:

• Run the command specific to your system (systemd, non-systemd, or Docker container).
• Examine the output for any warnings or error messages that might indicate issues. These messages should provide clues about the root cause of the problem.

System with systemd

Use the following command to view logs generated since the last Netdata service restart:

journalctl _SYSTEMD_INVOCATION_ID="$(systemctl show --value --property=InvocationID netdata)" --namespace=netdata --grep x509check

System without systemd

Locate the collector log file, typically at /var/log/netdata/collector.log, and use grep to filter for collector's name:

grep x509check /var/log/netdata/collector.log

Note: This method shows logs from all restarts. Focus on the latest entries for troubleshooting current issues.

Docker Container

If your Netdata runs in a Docker container named "netdata" (replace if different), use this command:

docker logs netdata 2>&1 | grep x509check