Remove unneeded references to execDriver

This includes:
 - updating the docs
 - removing dangling variables

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

contrib/completion/fish/docker.fish

@@ -51,7 +51,7 @@ complete -c docker -f -n '__fish_docker_no_subcommand' -s d -l daemon -d 'Enable
 complete -c docker -f -n '__fish_docker_no_subcommand' -l dns -d 'Force Docker to use specific DNS servers'
 complete -c docker -f -n '__fish_docker_no_subcommand' -l dns-opt -d 'Force Docker to use specific DNS options'
 complete -c docker -f -n '__fish_docker_no_subcommand' -l dns-search -d 'Force Docker to use specific DNS search domains'
-complete -c docker -f -n '__fish_docker_no_subcommand' -l exec-opt -d 'Set exec driver options'
+complete -c docker -f -n '__fish_docker_no_subcommand' -l exec-opt -d 'Set runtime execution options'
 complete -c docker -f -n '__fish_docker_no_subcommand' -l fixed-cidr -d 'IPv4 subnet for fixed IPs (e.g. 10.20.0.0/16)'
 complete -c docker -f -n '__fish_docker_no_subcommand' -l fixed-cidr-v6 -d 'IPv6 subnet for fixed IPs (e.g.: 2001:a02b/48)'
 complete -c docker -f -n '__fish_docker_no_subcommand' -s G -l group -d 'Group to assign the unix socket specified by -H when running in daemon mode'

contrib/completion/zsh/_docker

@@ -650,8 +650,8 @@ __docker_subcommand() {
                 "($help)*--dns-opt=[DNS options to use]:DNS option: " \
                 "($help)*--default-ulimit=[Default ulimit settings for containers]:ulimit: " \
                 "($help)--disable-legacy-registry[Do not contact legacy registries]" \
-                "($help)*--exec-opt=[Exec driver options]:exec driver options: " \
+                "($help)*--exec-opt=[Runtime execution options]:runtime execution options: " \
-                "($help)--exec-root=[Root of the Docker execdriver]:path:_directories" \
+                "($help)--exec-root=[Root directory for execution state files]:path:_directories" \
                 "($help)--fixed-cidr=[IPv4 subnet for fixed IPs]:IPv4 subnet: " \
                 "($help)--fixed-cidr-v6=[IPv6 subnet for fixed IPs]:IPv6 subnet: " \
                 "($help -G --group)"{-G=,--group=}"[Group for the unix socket]:group:_groups" \

docs/reference/commandline/daemon.md

@@ -32,8 +32,8 @@ weight = -1
       --dns-opt=[]                           DNS options to use
       --dns-search=[]                        DNS search domains to use
       --default-ulimit=[]                    Set default ulimit settings for containers
-      --exec-opt=[]                          Set exec driver options
+      --exec-opt=[]                          Set runtime execution options
-      --exec-root="/var/run/docker"          Root of the Docker execdriver
+      --exec-root="/var/run/docker"          Root directory for execution state files
       --fixed-cidr=""                        IPv4 subnet for fixed IPs
       --fixed-cidr-v6=""                     IPv6 subnet for fixed IPs
       -G, --group="docker"                   Group for the unix socket
@@ -476,24 +476,26 @@ Currently supported options of `zfs`:
 
         $ docker daemon -s zfs --storage-opt zfs.fsname=zroot/docker
 
-## Docker execdriver option
+## Docker runtime execution options
 
-The Docker daemon uses a specifically built `libcontainer` execution driver as
+The Docker daemon relies on a
-its interface to the Linux kernel `namespaces`, `cgroups`, and `SELinux`.
+[OCI](https://github.com/opencontainers/specs) compliant runtime
+(invoked via the `containerd` daemon) as its interface to the Linux
+kernel `namespaces`, `cgroups`, and `SELinux`.
 
-## Options for the native execdriver
+## Options for the runtime
 
-You can configure the `native` (libcontainer) execdriver using options specified
+You can configure the runtime using options specified
 with the `--exec-opt` flag. All the flag's options have the `native` prefix. A
 single `native.cgroupdriver` option is available.
 
 The `native.cgroupdriver` option specifies the management of the container's
-cgroups. You can specify `cgroupfs` or `systemd`. If you specify `systemd` and
+cgroups. You can specify only specify `cgroupfs` at the moment.  If you omit the
-it is not available, the system uses `cgroupfs`. If you omit the
 `native.cgroupdriver` option,` cgroupfs` is used.
-This example sets the `cgroupdriver` to `systemd`:
 
-    $ sudo docker daemon --exec-opt native.cgroupdriver=systemd
+This example explicitely sets the `cgroupdriver` to `cgroupfs`:
+
+    $ sudo docker daemon --exec-opt native.cgroupdriver=cgroupfs
 
 Setting this option applies to all containers the daemon launches.
 

man/docker-daemon.8.md

@@ -126,10 +126,10 @@ format.
   DNS search domains to use.
 
 **--exec-opt**=[]
-  Set exec driver options. See EXEC DRIVER OPTIONS.
+  Set runtime execution options. See RUNTIME EXECUTION OPTIONS.
 
 **--exec-root**=""
-  Path to use as the root of the Docker exec driver. Default is `/var/run/docker`.
+  Path to use as the root of the Docker execution state files. Default is `/var/run/docker`.
 
 **--fixed-cidr**=""
   IPv4 subnet for fixed IPs (e.g., 10.20.0.0/16); this subnet must be nested in the bridge subnet (which is defined by \-b or \-\-bip)

man/docker-inspect.1.md

@@ -110,7 +110,6 @@ To get information on a container use its ID or instance name:
     "Name": "/adoring_wozniak",
     "RestartCount": 0,
     "Driver": "devicemapper",
-    "ExecDriver": "native-0.2",
     "MountLabel": "",
     "ProcessLabel": "",
     "Mounts": [

man/docker.1.md

@@ -224,15 +224,14 @@ inside it)
   See **docker-wait(1)** for full documentation on the **wait** command.
 
 
-# EXEC DRIVER OPTIONS
+# RUNTIME EXECUTION OPTIONS
 
 Use the **--exec-opt** flags to specify options to the execution driver.
 The following options are available:
 
 #### native.cgroupdriver
-Specifies the management of the container's `cgroups`. You can specify 
+Specifies the management of the container's `cgroups`. Only `cgroupfs` can be specified
-`cgroupfs` or `systemd`. If you specify `systemd` and it is not available, the 
+`cgroupfs` at the moment.
-system uses `cgroupfs`.
 
 #### Client
 For specific client examples please see the man page for the specific Docker