Add syslog-address log-opt

Signed-off-by: Antonio Murdaca <me@runcom.ninja>

docs/sources/reference/commandline/cli.md

@@ -175,6 +175,7 @@ expect an integer, and they can only be specified once.
       -l, --log-level="info"                 Set the logging level
       --label=[]                             Set key=value labels to the daemon
       --log-driver="json-file"               Default driver for container logs
+      --log-opt=[]                           Log driver specific options
       --mtu=0                                Set the containers network MTU
       -p, --pidfile="/var/run/docker.pid"    Path to use for daemon PID file
       --registry-mirror=[]                   Preferred Docker registry mirror
@@ -998,6 +999,7 @@ Creates a new container.
       --label-file=[]            Read in a line delimited file of labels
       --link=[]                  Add link to another container
       --log-driver=""            Logging driver for container
+      --log-opt=[]               Log driver specific options
       --lxc-conf=[]              Add custom lxc options
       -m, --memory=""            Memory limit
       --mac-address=""           Container MAC address (e.g. 92:d0:c6:0a:29:33)
@@ -1963,6 +1965,7 @@ To remove an image using its digest:
       --ipc=""                   IPC namespace to use
       --link=[]                  Add link to another container
       --log-driver=""            Logging driver for container
+      --log-opt=[]               Log driver specific options
       --lxc-conf=[]              Add custom lxc options
       -m, --memory=""            Memory limit
       -l, --label=[]             Set metadata on the container (e.g., --label=com.example.key=value)

docs/sources/reference/run.md

@@ -873,18 +873,31 @@ this driver.
 Default logging driver for Docker. Writes JSON messages to file. `docker logs`
 command is available only for this logging driver
 
+The following logging options are supported for this logging driver: [none]
+
 #### Logging driver: syslog
 
 Syslog logging driver for Docker. Writes log messages to syslog. `docker logs`
 command is not available for this logging driver
 
+The following logging options are supported for this logging driver:
+
+    --log-opt address=[tcp|udp]://host:port
+    --log-opt address=unix://path
+
+`address` specifies the remote syslog server address where the driver connects to.
+If not specified it defaults to the local unix socket of the running system.
+If transport is either `tcp` or `udp` and `port` is not specified it defaults to `514`
+The following example shows how to have the `syslog` driver connect to a `syslog`
+remote server at `192.168.0.42` on port `123`
+
+    $ docker run --log-driver=syslog --log-opt address=tcp://192.168.0.42:123
+
 #### Logging driver: journald
 
 Journald logging driver for Docker. Writes log messages to journald; the container id will be stored in the journal's `CONTAINER_ID` field. `docker logs` command is not available for this logging driver.  For detailed information on working with this logging driver, see [the journald logging driver](reference/logging/journald) reference documentation.
 
-#### Log Opts : 
-
-Logging options for configuring a log driver. The following log options are supported: [none]
+The following logging options are supported for this logging driver: [none]
 
 ## Overriding Dockerfile image defaults