Process Collection
Gremlin can collect information about the processes running on the Linux machines where the Gremlin Agent is installed. This process information is required to define Services in Gremlin Reliability Management and helps inform Gremlin's Service features.
As of Linux Agent version 2.25.0, Gremlin automatically enables Process Collection.
What is collected?
For every process visible to the Gremlin Agent, Gremlin will collect:
- process ID (PID)
- parent process ID (PPID)
- active UDP and TCP sockets (
ipaddress:port
) - path to process executable
- command line argument to process
Requirements
- Gremlin Agent version
2.18.0
- Gremlin Kubernetes Chao version
0.3+
- Gremlin must run within the PID namespace of the host; for Kubernetes this means hostPID=true
- Gremlin needs the CAP_SYS_PTRACE capability
- Gremlin needs the CAP_DAC_READ_SEARCH capability
Process Collection is not supported for Windows.
Enable Process Collection
As of Linux Agent version 2.25.0, Gremlin automatically enables Process Collection.
To enable Process Collection, use one of the following methods:
- set
GREMLIN_COLLECT_PROCESSES=true
in the Gremlin agent environment (by writing to/etc/default/gremlind
) - set
collect_processes: true
in /etc/gremlin/config.yaml
Examples
The following sections show examples for enabling Process Collection on your platform.
Existing installation
1# This setcap command is only required for versions below 2.18.0. These capabilities are set by default in later versions.2sudo setcap cap_sys_ptrace,cap_dac_read_search+ep /usr/sbin/gremlind \3 && echo GREMLIN_COLLECT_PROCESSES=true | sudo tee -a /etc/default/gremlind \4 && sudo systemctl restart gremlind
APT
1echo "deb https://deb.gremlin.com/ release non-free" | sudo tee /etc/apt/sources.list.d/gremlin.list \2 && sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 9CDB294B29A5B1E2E00C24C022E8EF3461A50EF6 \3 && sudo apt update \4 && GREMLIN_COLLECT_PROCESSES=true sudo -E apt install gremlin gremlind
YUM
1sudo curl https://rpm.gremlin.com/gremlin.repo -o /etc/yum.repos.d/gremlin.repo \2 && GREMLIN_COLLECT_PROCESSES=true sudo -E yum install gremlin gremlind
Kubernetes
helm upgrade
instead of helm install
.1helm repo add gremlin https://helm.gremlin.com2helm repo update3helm install gremlin gremlin/gremlin \4 --namespace gremlin \5 --set gremlin.hostPID=true \6 --set gremlin.collect.processes=true \7 --set gremlin.secret.managed=true \8 --set gremlin.secret.type=secret \9 --set gremlin.secret.clusterID=my-cluster \10 --set gremlin.secret.teamID=$GREMLIN_TEAM_ID \11 --set gremlin.secret.teamSecret=$GREMLIN_TEAM_SECRET
Docker
1docker run -d \2 --pid=host \3 --cap-add=SYS_PTRACE \4 -v /var/lib/gremlin:/var/lib/gremlin \5 -v /var/log/gremlin:/var/log/gremlin \6 -v /var/run/docker.sock:/var/run/docker.sock \7 -e GREMLIN_TEAM_ID \8 -e GREMLIN_TEAM_SECRET \9 -e GREMLIN_IDENTIFIER \10 -e GREMLIN_COLLECT_PROCESSES=true \11 gremlin/gremlin daemon
Disable Process Collection
To disable Process Collection, use one of the following methods:
- set
GREMLIN_COLLECT_PROCESSES=false
in the Gremlin agent environment (by writing to/etc/default/gremlind
) - set
collect_processes: false
in /etc/gremlin/config.yaml
Examples
The following sections show examples for disabling Process Collection on your platform.
Existing installation
1echo GREMLIN_COLLECT_PROCESSES=false | sudo tee -a /etc/default/gremlind \2 && sudo systemctl restart gremlind
APT
1echo "deb https://deb.gremlin.com/ release non-free" | sudo tee /etc/apt/sources.list.d/gremlin.list \2 && sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 9CDB294B29A5B1E2E00C24C022E8EF3461A50EF6 \3 && sudo apt update \4 && GREMLIN_COLLECT_PROCESSES=false sudo -E apt install gremlin gremlind
YUM
1sudo curl https://rpm.gremlin.com/gremlin.repo -o /etc/yum.repos.d/gremlin.repo \2 && GREMLIN_COLLECT_PROCESSES=false sudo -E yum install gremlin gremlind
Kubernetes
helm upgrade
instead of helm install
.1helm repo add gremlin https://helm.gremlin.com2helm repo update3helm install gremlin gremlin/gremlin \4 --namespace gremlin \5 --set gremlin.hostPID=true \6 --set gremlin.collect.processes=false \7 --set gremlin.secret.managed=true \8 --set gremlin.secret.type=secret \9 --set gremlin.secret.clusterID=my-cluster \10 --set gremlin.secret.teamID=$GREMLIN_TEAM_ID \11 --set gremlin.secret.teamSecret=$GREMLIN_TEAM_SECRET
Docker
1docker run -d \2 --pid=host \3 --cap-add=SYS_PTRACE \4 -v /var/lib/gremlin:/var/lib/gremlin \5 -v /var/log/gremlin:/var/log/gremlin \6 -v /var/run/docker.sock:/var/run/docker.sock \7 -e GREMLIN_TEAM_ID \8 -e GREMLIN_TEAM_SECRET \9 -e GREMLIN_IDENTIFIER \10 -e GREMLIN_COLLECT_PROCESSES=false \11 gremlin/gremlin daemon