Resolving errors when setting up TLS connections on VMs

To change the MTU value for all network interfaces created for Docker containers on the VM, modify the Docker service configuration. To do this, follow these steps:

1. Run this command: sudo nano /etc/docker/daemon.json and add the following section to the file:

   {
   "mtu": 1450
   }
   

2. Save the file and restart the Docker service: sudo systemctl restart docker.

• Managed Service for Kubernetes

To change MTU for the network interfaces of all VMs in the Managed Service for Kubrenetes node group, you need to create an object of type DaemonSet and apply it to the cluster. To do this, follow these steps:

1. Create a file with the object manifest file by running: nano ds-set-mtu.yaml.
   Add the following content to the file:

   apiVersion: apps/v1
   kind: DaemonSet
   metadata:
   name: set-mtu
   spec:
   selector:
      matchLabels:
         app: set-mtu
   template:
      metadata:
         labels:
         app: set-mtu
      spec:
         containers:
         - name: set-mtu
         image: amouat/network-utils
         command: ["sh", "-c", "ip link set dev <interface_name> mtu 1450"]
         securityContext:
            privileged: true
         resources:
            requests:
               cpu: "100m"
               memory: "50Mi"
            limits:
               cpu: "200m"
               memory: "100Mi"
         hostNetwork: true
         nodeSelector:
         kubernetes.io/os: linux
   

2. Save the manifest file and apply it to the cluster: kubectl apply -f ds-set-mtu.yaml.

To change MTU on the VM interface, run the cmd command interpreter as an administrator, then complete these steps:

1. Run the netsh interface ipv4 show subinterfaces command to display a list of all available network interfaces on the VM.
   In the Interface field, select and save the name of the network interface on which you need to change the MTU value.

2. Run the netsh interface ipv4 set subinterface "<interface_name>" mtu=1450 store=persistent command, specifying the name of the desired network interface, to set the desired MTU value for it. The specified value is saved after system reboot.

3. Reboot the VM instance.

4. Make sure that the MTU value was saved for the network device by running the netsh interface ipv4 show subinterfaces command.