Useful-commands.md

 # xcache service unit
+
 Show status
+
 ```bash
 systemctl status systemd-nspawn@xcache
 ```
+
 Restart
+
 ```bash
 systemctl restart systemd-nspawn@xcache
 ```
+
 Show logs
+
 ```bash
 journalctl -eu systemd-nspawn@xcache [--since ...]
 ```
@@ -15,6 +21,7 @@ journalctl -eu systemd-nspawn@xcache [--since ...]
 # container commands
 
 get a shell as xrootd user in a new temporary container using the xcache image
+
 ```bash
 systemd-nspawn --keep-unit --register=no -M xcache /bin/bash
 ```
@@ -28,11 +35,33 @@ systemd-nspawn --volatile=overlay --register=no --private-users=655360 -u xrootd
 ```
 
 To get a shell in the **running** xcache container (as root, usually not nescessary)
+
 ```
 nsenter --target=$(machinectl show --property Leader xcache | sed "s/^Leader=//")  --all
 ```
 
 inside, one can then switch to a shell as the xrootd user with e.g.
+
 ```
 su -s /bin/bash xrootd
 ```
+
+# Manually delete files from cache
+
+This needs to be done inside the running container since it may need to clean up rucio metalink files from `dev/shm` which is currently a directory inside the container (not bind mounted).
+
+So, as root do
+
+```bash
+nsenter --target=$(machinectl show --property Leader xcache | sed "s/^Leader=//")  --all
+```
+
+And then
+
+```bash
+/var/local/xcache/rm_cached_file.sh <pattern>
+# e.g. to delete all files starting with AOD.05536542
+/var/local/xcache/rm_cached_file.sh AOD.05536542
+# or all files in the mc15_13TeV scope
+/var/local/xcache/rm_cached_file.sh mc15_13TeV
+```
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