5.11. Executing commands inside a running container

Procedure

1. Execute the rpm -qa command inside the my-support-tools container to list all installed packages:

   $ podman exec -it my-support-tools rpm -qa
   gpg-pubkey-fd431d51-4ae0493b
   gpg-pubkey-5a6340b3-6229229e
   libgcc-11.5.0-2.el9.x86_64
   setup-2.13.7-10.el9.noarch
   ...

2. Execute a /bin/bash command in the my-support-tools container:

   $ podman exec -it my-support-tools /bin/bash

3. Install the procps-ng package containing a set of system utilities (for example ps, top, uptime, and so on):

   # dnf install procps-ng

4. Inspect the container:

   • To list every process on the system:

     # ps -ef
     UID          PID    PPID  C STIME TTY          TIME CMD
     root           8       0  0 11:07 pts/0    00:00:00 /bin/bash
     root          47       8  0 11:13 pts/0    00:00:00 ps -ef

   • To display file system disk space usage:

     # df -h
     Filesystem      Size  Used Avail Use% Mounted on
     tmpfs           6.3G  448K  6.3G   1% /etc/hosts
     shm              63M     0   63M   0% /dev/shm
     overlay         953G   76G  877G   8% /
     tmpfs            64M     0   64M   0% /dev
     devtmpfs        4.0M     0  4.0M   0% /dev/tty
     ...

   • To display system information:

     # uname -r
     6.13.4-200.fc41.x86_64

   • To display amount of free and used memory in megabytes:

     # free --mega
     total        used        free      shared  buff/cache   available
     Mem:       2818         615        1183          12         1020        1957
     Swap:      3124           0        3124