SRL gRPC Tunnel is an SR Linux NDK application that adds support for Openconfig gRPC tunnel to SR Linux.
It acts as a gRPC tunnel client to allow access to locally configured targets (gNMI server, gNOI server, SSH server...)
It connects to a gRPC tunnel server such as gNMIc.
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gRPC tunnel client handles gNMI, SSH and custom targets
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Both secure and insecure connections are supported
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Multiple destinations per tunnel (all active)
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Multiple targets per tunnel
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Predefined target ID (node-name, user-agent, mac-address)
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Predefined target type (gNMI server, SSH server)
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Custom target ID and Type, either a user defined string or a Go template.
For an automated lab deployment with 2 SR Linux, 2 gNMIc (tunnel server), a Prometheus server and a consul server see here
Download the pre build .deb file from the repo's release page, or run:
version=0.1.8
wget https://github.com/karimra/srl-grpc-tunnel/releases/download/v${version}/srl-grpc-tunnel_${version}_Linux_x86_64.debCopy the .deb file to your SR Linux instance and run (from bash)
sudo dpkg -i srl-grpc-tunnel_${version}_Linux_x86_64.debReload the application manager
sr_cli tools system app-management application app_mgr reloadCheck that the grpc-tunnel application is running
--{ + running }--[ ]--
A:srl1# show system application grpc-tunnel
+-------------+------+---------+----------------+--------------------------+
| Name | PID | State | Version | Last Change |
+=============+======+=========+================+==========================+
| grpc-tunnel | 2837 | running | v0.1.0-42f4b74 | 2022-03-30T05:21:57.649Z |
+-------------+------+---------+----------------+--------------------------+
--{ + running }--[ ]--
A:srl1# This application relies on SRL's gNMI server unix socket to serve sessions towards GNMI_GNOI targets. It should be enabled before starting the grpc-tunnel application.
enter candidate
# enable the gnmi-server unix-socket
/ system gnmi-server unix-socket admin-state enable
# disable authentication (optional)
/ system gnmi-server unix-socket use-authentication false
# enable gNMI and gNOI (optional) services
/ system gnmi-server unix-socket services [ gnmi gnoi ]
# commit
commit nowThe application configuration has 3 sections; its admin-state, the list of destinations and the tunnels
--{ + running }--[ system grpc-tunnel ]--
A:srl1#
Local commands:
admin-state* Administrative state of the gRPC tunnel application
destination list of gRPC tunnel destinations, i.e gRPC tunnel servers
tunnel gRPC tunnel(s)--{ + running }--[ system grpc-tunnel ]--
A:srl1# destination d1
usage: destination <name>
list of gRPC tunnel destinations, i.e gRPC tunnel servers
Positional arguments:
name [string] destination name
Local commands:
address* destination address
description* destination description
network-instance*
Reference to a configured network-instance used to establish the gRPC
tunnel from.
no-tls* when true the connection to this destination will be insecure
port* destination port number
tls-profile* NOT IMPLEMENTED: Reference to the TLS profile to use when initiating
connections to this destination.Setting a tls-profile on the client side is not implemented yet, by default the tunnel client will use a one-way TLS connection. TLS can be disabled by setting no-tls true
To configure a gRPC tunnel destination d1 run the below commands:
enter candidate
# create destination d1
/ system grpc-tunnel destination d1
# set an address and a port number for d1
/ system grpc-tunnel destination d1 address 172.20.20.2 port 57401 # (default port 57401)
# use a non secure connection for d1
/ system grpc-tunnel destination d1 no-tls true
# use network-instance mgmt to connect to destination d1 (default: mgmt)
/ system grpc-tunnel destination d1 network-instance mgmt # default
commit now--{ + running }--[ system grpc-tunnel destination d1 ]--
A:srl1# info
address 172.20.20.2
port 57401
network-instance mgmt
no-tls true
--{ + running }--[ system grpc-tunnel destination d1 ]--
A:srl1#
gnmic -a clab-grpc-tunnel-srl1 -u admin -p admin --skip-verify set \
--update /system/grpc-tunnel/destination[name=d1]/address:::json_ietf:::172.20.20.2 \
--update /system/grpc-tunnel/destination[name=d1]/port:::json_ietf:::57401 \
--update /system/grpc-tunnel/destination[name=d1]/network-instance:::json_ietf:::mgmt \
--update /system/grpc-tunnel/destination[name=d1]/no-tls:::json_ietf:::trueCreate a Tunnel t1 and link the destination d1 to it.
A max of 16 tunnels can be created, To each one, 16 destinations can be linked.
To configure a gRPC tunnel t1 run the below commands:
enter candidate
# create tunnel d1
/ system grpc-tunnel tunnel t1
# link destination d1 to tunnel t1
/ system grpc-tunnel tunnel t1 destination d1
commit nowgnmic -a clab-grpc-tunnel-srl1 -u admin -p admin --skip-verify set \
--update /system/grpc-tunnel/tunnel[name=t1]:::json_ietf:::'{"destination":{"name":"d1"}}'--{ + running }--[ system grpc-tunnel tunnel t1 ]--
A:srl1# target tg1
usage: target <name>
Positional arguments:
name [string, length 1..256] target local name
Local commands:
id target ID
local-address* local address to dial for an established tunnel towards this target
type target type
The id and type are the unique identifiers used to register the target with the gRPC tunnel server.
The local-address is used to customize the local handler behavior by changing the dialed address when a request is received through the tunnel.
The target id values are:
node-name: The configure node host-name undersystem name host-nameuser-agent: A custom string in the format<node-name>:nokia-srl:<chassis>:<sw-version>mac-address: The node chassis mac addresscustom <string>: A user defined string, or a Go template that uses the systemInfo struct as input.
The target type values are:
grpc-server: This sets the target type toGNMI_GNOIwhen registering the target with the gRPC tunnel server. In this case, thelocal-addressdefaults tounix:///opt/srlinux/var/run/sr_gnmi_server.ssh-server: This sets the target type toSSHwhen registering the target with the gRPC tunnel server. In this case, thelocal-addressdefaults tolocalhost:22.custom: Sets a custom string or Go template as the targettype. In this case setting thelocal-addressis mandatory.
E.g: Add a target called tg1, type grpc-server with ID node-name
enter candidate
# add target with type `grpc-server`
/ system grpc-tunnel tunnel t1 target tg1 type grpc-server
# set target ID to `node-name`
/ system grpc-tunnel tunnel t1 target tg1 id node-name
commit nowgnmic -a clab-grpc-tunnel-srl1 -u admin -p admin --skip-verify set \
--update /system/grpc-tunnel/tunnel[name=t1]/target[name=tg1]/type/grpc-server:::json_ietf:::'[null]' \
--update /system/grpc-tunnel/tunnel[name=t1]/target[name=tg1]/id/node-name:::json_ietf:::'[null]'enter candidate
# enable tunnel t1
/ system grpc-tunnel tunnel t1 admin-state enable
commit nowgnmic -a clab-grpc-tunnel-srl1 -u admin -p admin --skip-verify set \
--update /system/grpc-tunnel/tunnel[name=t1]/admin-state:::json_ietf:::enable--{ + running }--[ system grpc-tunnel ]--
A:srl1# info from state
admin-state enable
oper-state up
destination d1 {
address 172.20.20.2
port 57401
network-instance mgmt
no-tls true
}
tunnel t1 {
admin-state enable
oper-state up
oper-state-down-reason ""
destination d1 {
oper-state up
oper-state-down-reason ""
target srl1 type GNMI_GNOI {
oper-state up
oper-state-down-reason ""
}
}
target tg1 {
id {
node-name
}
type {
grpc-server
}
}
}
--{ + running }--[ system grpc-tunnel ]--
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