configure docker-init binary path

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

docs/reference/commandline/dockerd.md

@@ -49,6 +49,7 @@ Options:
       --help                                 Print usage
       --icc=true                             Enable inter-container communication
       --init                                 Run an init inside containers to forward signals and reap processes
+      --init-path                            Path to the docker-init binary
       --insecure-registry=[]                 Enable insecure registry communication
       --ip=0.0.0.0                           Default IP when binding container ports
       --ip-forward=true                      Enable net.ipv4.ip_forward
@@ -1142,6 +1143,7 @@ This is a full example of the allowed configuration options on Linux:
 	"cgroup-parent": "",
 	"default-ulimits": {},
 	"init": false,
+	"init-path": "/usr/libexec/docker-init",
 	"ipv6": false,
 	"iptables": false,
 	"ip-forward": false,

man/dockerd.8.md

@@ -35,6 +35,7 @@ dockerd - Enable daemon mode
 [**--help**]
 [**--icc**[=*true*]]
 [**--init**[=*false*]]
+[**--init-path**[=*""*]]
 [**--insecure-registry**[=*[]*]]
 [**--ip**[=*0.0.0.0*]]
 [**--ip-forward**[=*true*]]
@@ -170,6 +171,9 @@ unix://[/path/to/socket] to use.
 **--init**
 Run an init process inside containers for signal forwarding and process reaping.
 
+**--init-path**
+Path to the docker-init binary.
+
 **--insecure-registry**=[]
   Enable insecure registry communication, i.e., enable un-encrypted and/or untrusted communication.