Exec

Exec Check executes a command or script file on the target host. The type of scripts executed include:

• Bash scripts
• Powershell scripts

exec-lookup.yml

---
apiVersion: canaries.flanksource.com/v1
kind: Topology
metadata:
  name: server
spec:
  type: Server
  icon: server
  schedule: '@every 30s'
  components:
    - name: Server
      icon: server
      type: server
      lookup:
        exec:
          - script: |
                mem_total=$(free -g | awk 'NR==2{printf "%d", $2}')
                mem_available=$(free -g | awk 'NR==2{printf "%d", $7}')
                kernel_version=$(uname -r)
                distro=$(awk -F'=' '/^NAME/ {print $2}' /etc/os-release | tr -d '"')
                hostname=$(hostname)
                ip_addresses=$(ip addr show | awk '/inet / {printf "%s %s\n", $NF, $2}')

                printf '{"memory":"%dGiB/%dGiB","kernel_version":"%s","distro":"%s","hostname":"%s","ip_addresses":"%s"}\n' "$mem_available" "$mem_total" "$kernel_version" "$distro" "$hostname" "$ip_addresses"
            display:
              expr: |
                [{
                  "name": results.stdout.JSON().hostname,
                  "properties": [
                    {"name": "Memory", "text": results.stdout.JSON().memory},
                    {"name": "Kernel", "text": results.stdout.JSON().kernel_version},
                    {"name": "Distro", "text": results.stdout.JSON().distro},
                    {"name": "ip_addresses", "text": results.stdout.JSON().ip_addresses },
                  ]
                }].toJSON()

Field	Description	Scheme	Required
display	Template to display server response in text (overrides default bar format for UI)	Template
labels	Labels for the check	Labels
script	Script can be a inline script or a path to a script that needs to be executed. On windows executed via powershell and in darwin and linux executed using bash.	string	Yes
transform	Template to transform results by excluding or including certain fields in result	Template

Results

The results variable in the template will contain the following fields

Field	Description	Scheme
stdout	stdout from the script	string
stderr	stderr from the script	string
exitCode	exit code of the script	int