Update README.md

Install NFSv2 in debian 11

howto/NFSServerSetup_in_debian_10_for_embedded_programmers/README.md

@@ -129,6 +129,79 @@ You should see this
     100003    2   udp   2049  nfs
     100003    3   udp   2049  nfs
 
+# Examples for Debian 11
+
+File `/etc/exports`:
+
+```
+# /etc/exports: the access control list for filesystems which may be exported
+#               to NFS clients.  See exports(5).
+#
+# Example for NFSv2 and NFSv3:
+# /srv/homes       hostname1(rw,sync,no_subtree_check) hostname2(ro,sync,no_subtree_check)
+#
+# Example for NFSv4:
+# /srv/nfs4        gss/krb5i(rw,sync,fsid=0,crossmnt,no_subtree_check)
+# /srv/nfs4/homes  gss/krb5i(rw,sync,no_subtree_check)
+#
+
+/srv                     *(rw,no_root_squash,subtree_check)
+/srv/tftp                192.168.1.0/255.255.255.0(rw,no_root_squash,subtree_check)
+/srv/nfs                 192.168.1.0/255.255.255.0(rw,no_root_squash,subtree_check)
+```
+
+File `/etc/default/nfs-common` :
+
+```
+# If you do not set values for the NEED_ options, they will be attempted
+# autodetected; this should be sufficient for most people. Valid alternatives
+# for the NEED_ options are "yes" and "no".
+
+# Do you want to start the statd daemon? It is not needed for NFSv4.
+NEED_STATD=
+
+# Options for rpc.statd.
+#   Should rpc.statd listen on a specific port? This is especially useful
+#   when you have a port-based firewall. To use a fixed port, set this
+#   this variable to a statd argument like: "--port 4000 --outgoing-port 4001".
+#   For more information, see rpc.statd(8) or http://wiki.debian.org/SecuringNFS
+STATDOPTS=
+
+# Do you want to start the idmapd daemon? It is only needed for NFSv4.
+NEED_IDMAPD=
+
+# Do you want to start the gssd daemon? It is required for Kerberos mounts.
+NEED_GSSD=
+
+```
+
+
+
+File `/etc/default/nfs-kernel-server` :
+
+```
+# Number of servers to start up
+# enable NFSv2
+RPCNFSDCOUNT="8 --nfs-version 2"
+
+# Runtime priority of server (see nice(1))
+RPCNFSDPRIORITY=0
+
+# Options for rpc.mountd.
+# If you have a port-based firewall, you might want to set up
+# a fixed port here using the --port option. For more information, 
+# see rpc.mountd(8) or http://wiki.debian.org/SecuringNFS
+# To disable NFSv4 on the server, specify '--no-nfs-version 4' here
+RPCMOUNTDOPTS="--no-nfs-version 4 --manage-gids"
+
+# Do you want to start the svcgssd daemon? It is only required for Kerberos
+# exports. Valid alternatives are "yes" and "no"; the default is "no".
+NEED_SVCGSSD=""
+
+# Options for rpc.svcgssd.
+RPCSVCGSSDOPTS=""
+
+```
 
 # Kernel 6