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As you mentioned the > cgroup namespace, it isn’t very helpful in some cases. Containers may > share the same cgroup namespace, and the container runtime often avoids > giving each container a private cgroup namespace for performance and > security reasons. Because of this, the cgroup namespace can’t be used as > a reliable or unique label for filtering trace logs. > > In my case, with container-d you can inspect a container, find its PID, > and then check /proc//ns/cgroup, but you’ll see that different > containers often have the same cgroup namespace ID (e.g., in the > following logs you can see the calico-node and kube-proxy containers > sharing a cgroup ns). If you want to track containers, the pid namespace is the one used by most container runtimes but I don't know specifically for container-d. > > ``` > Name: calico-node  CID: > b5624afe31b005725f4ba53c7b6fe758f3c09fabf013085231ff8b97588f6ace  PID: > 2243  cgroup_ns_inode: 4026531835 > Name: kube-proxy  CID: > 52f3c12def7a680f61a925ac92dd5ebd5eba6cad17d671efbfd1d40db7dff624  PID: > 1851  cgroup_ns_inode: 4026531835 >   >> MATCH FOUND: shares ns with container: > b5624afe31b005725f4ba53c7b6fe758f3c09fabf013085231ff8b97588f6ace > (calico-node) > ``` > > Thanks again for your answers. I hope this feature appears in a future > patch. > > Best, > Amir > > On Thu, Dec 11, 2025 at 9:57 AM Michael Jeanson > wrote: > > On 12/11/25 09:30, Kienan Stewart via lttng-dev wrote: > > Hi Amir, > > > > On 12/10/25 9:40 PM, Amir Najafi Zadeh via lttng-dev wrote: > >> Hello everyone, > >> > >> I hope you’re doing well. My name is Amir, and I’m a PhD student in > >> the Computer Science department at Stony Brook University, New York. > >> > >> I have a question about the LTTng context that I haven’t been > able to > >> find an answer for in the docs or man pages. Does LTTng support > adding > >> the cgroup ID or cgroup path as a context field? I want to > filter my > >> trace results based on cgroups. > >> > > > > I think you're looking for the `cgroup_ns` context which adds the > inum > > of the cgroup namespace as a context field. > > This will give you the ID of the cgroup namespace but we don't have > contexts for cgroups themselves. It's probably something we would like > to have but there is no concrete plans on implementing this at the > moment. > > > > >> If this isn’t supported, are there any plans to add it in future > >> versions, such as 2.14? > >> > >> For reference, I’m currently using LTTng 2.13 on Ubuntu 24.04 with > >> kernel 6.8.0-87-generic. > >> > >> Cheers, > >> Amir > >> -- > >> *Amirhossein Najafizadeh* > >> *PhD Student, Computer Science Department, Stony Brook > University, N.Y. > >> File systems and Storage Lab (FSL) >