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--- tips:accessing_dev_mem_for_host_from_lxc_container [2021/07/14 17:04] – navaneeth
+++ tips:accessing_dev_mem_for_host_from_lxc_container [2025/03/18 19:00] (current) – vignesh
@@ Line 1: / Line 1: @@
-====== DMIDECODE Error ======
+====== Problem getting machineid on LXC/LXD container ======
-To Access /dev/mem for Host from container,
+When you install Trisul packages like the probe or  hub on a LXC/LXD linux container you might face an error where Trisul is unable to get the machineID of the container.
+The error could be something like the following ; when you try to get the machineID from the hub or probe node from the admin panel.
+{{:tips:trisul_network_analytics_14-07-2021_18-36-20.png?800|}}
+===== Fix this error to allow LXC nodes to get the machineID =====
+Essentially you need to set the container permissions to allow access to the /dev/mem device from the host which is used as part of dmidecode.  Do the following steps.
-Please run the following commands.
 <code>
 lxc stop <container_name>
 lxc config set <container_name> security.privileged true
-lxc config set <container_name> raw.lxc 'lxc.cap.drop='
-lxc config set <container_name> raw.lxc 'lxc.cap.keep='
 lxc config device add <container_name> devmem unix-char source=/dev/mem
-lxc exec <container_name> dmidecode
 lxc start <container_name>
 </code>
-You can run these commands when you find the following errors.
+To test if it works do
+<code>
+lxc exec <container_name> dmidecode
+</code>
+If that does not work add the following commands and retry
+<code>
+lxc config set <container_name> raw.lxc 'lxc.cap.drop='
+lxc config set <container_name> raw.lxc 'lxc.cap.keep='
+</code>
-<note warning>/dev/mem: Operation not permitted</note>