Is there a command to check if the container services are running on a Linux system? Someone suggested
unshare but I am not sure if that is the best way to do it.
UPDATE: Upon re-reading your question, I realized that I had answered a slightly different one. You want to know whether a service is running, and I had originally answered how to tell if a package was installed. To answer your actual question, it depends upon your init system.
systemd - the basic command is
systemctl, which will list all services and their states, so you could either manually browse it manually or pipe it through a
grepcommand, like so:
systemctl | grep -e cgmanager -e cgproxy -e cgroupfs-mount. Or, as user muru suggests in the comments, simply
systemctl status 'cg*'.
sysVinit - the basic command is
service --status-alland the grep command would be
service --status-all 2>&1 | grep -e cgmanager -e cgproxy -e cgroupfs-mount. Note that in this case, running services are denoted with a
[+]prefix symbol. Also note that for the grep to work, the redirect
2>&1must be made for the
Maybe the simplest thing to do is try
man cgroups. If that brings up a documentation page, then your host has the package installed. However, some installs are 'stingy' and don't install
You could try
cgmand see if that produces output. Most installs of
cgroupswill include that command, but not necessarily.
You could look up the package list of your host distribution. On debian derivatives, that would be
dpkg -l |grep cgroup, but occasionally a system will restrict access to
There will be a lot of other ways.
You can check which cgroup features are enabled in kernel config with:
# zcat /proc/config.gz | grep CGROUP CONFIG_CGROUPS=y CONFIG_BLK_CGROUP=y # CONFIG_DEBUG_BLK_CGROUP is not set CONFIG_CGROUP_WRITEBACK=y CONFIG_CGROUP_SCHED=y CONFIG_CGROUP_PIDS=y # CONFIG_CGROUP_RDMA is not set # CONFIG_CGROUP_FREEZER is not set CONFIG_CGROUP_HUGETLB=y CONFIG_CGROUP_DEVICE=y CONFIG_CGROUP_CPUACCT=y CONFIG_CGROUP_PERF=y # CONFIG_CGROUP_DEBUG is not set # CONFIG_SOCK_CGROUP_DATA is not set # CONFIG_NETFILTER_XT_MATCH_CGROUP is not set # CONFIG_CGROUP_NET_PRIO is not set # CONFIG_CGROUP_NET_CLASSID is not set
(note: in order for
/proc/config.gz to show up
need to be set)