Merge pull request #2591 from thaJeztah/19.03_backport_docs_fixes2

[19.03 backport] assorted docs fixes
Upstream-commit: ab45dc8fdc8379cbc3471228e4f16f69bccfe605
Component: cli

Author: silvin-lubecki

components/cli/docs/reference/builder.md

@@ -608,7 +608,7 @@ FROM [--platform=<platform>] <image>[@<digest>] [AS <name>]
 ```
 
 The `FROM` instruction initializes a new build stage and sets the
-[*Base Image*](../../glossary/#base-image) for subsequent instructions. As such, a
+[*Base Image*](https://docs.docker.com/glossary/#base_image) for subsequent instructions. As such, a
 valid `Dockerfile` must start with a `FROM` instruction. The image can be
 any valid image – it is especially easy to start by **pulling an image** from
 the [*Public Repositories*](https://docs.docker.com/engine/tutorials/dockerrepos/).

components/cli/docs/reference/commandline/cli.md

@@ -61,27 +61,27 @@ by the `docker` command line:
 
 * `DOCKER_API_VERSION` The API version to use (e.g. `1.19`)
 * `DOCKER_CONFIG` The location of your client configuration files.
-* `DOCKER_CERT_PATH` The location of your authentication keys.
 * `DOCKER_CLI_EXPERIMENTAL` Enable experimental features for the cli (e.g. `enabled` or `disabled`)
-* `DOCKER_DRIVER` The graph driver to use.
 * `DOCKER_HOST` Daemon socket to connect to.
-* `DOCKER_NOWARN_KERNEL_VERSION` Prevent warnings that your Linux kernel is
-  unsuitable for Docker.
-* `DOCKER_RAMDISK` If set this will disable 'pivot_root'.
 * `DOCKER_STACK_ORCHESTRATOR` Configure the default orchestrator to use when using `docker stack` management commands.
-* `DOCKER_TLS` When set Docker uses TLS.
-* `DOCKER_TLS_VERIFY` When set Docker uses TLS and verifies the remote.
 * `DOCKER_CONTENT_TRUST` When set Docker uses notary to sign and verify images.
   Equates to `--disable-content-trust=false` for build, create, pull, push, run.
 * `DOCKER_CONTENT_TRUST_SERVER` The URL of the Notary server to use. This defaults
   to the same URL as the registry.
 * `DOCKER_HIDE_LEGACY_COMMANDS` When set, Docker hides "legacy" top-level commands (such as `docker rm`, and
   `docker pull`) in `docker help` output, and only `Management commands` per object-type (e.g., `docker container`) are
   printed. This may become the default in a future release, at which point this environment-variable is removed.
-* `DOCKER_TMPDIR` Location for temporary Docker files.
 * `DOCKER_CONTEXT` Specify the context to use (overrides DOCKER_HOST env var and default context set with "docker context use")
 * `DOCKER_DEFAULT_PLATFORM` Specify the default platform for the commands that take the `--platform` flag.
 
+#### Shared Environment variables
+
+These environment variables can be used both with the `docker` command line and
+`dockerd` command line:
+
+* `DOCKER_CERT_PATH` The location of your authentication keys.
+* `DOCKER_TLS_VERIFY` When set Docker uses TLS and verifies the remote.
+
 Because Docker is developed using Go, you can also use any environment
 variables used by the Go runtime. In particular, you may find these useful:
 

components/cli/docs/reference/commandline/dockerd.md

@@ -117,6 +117,19 @@ the `daemon.json` file.
 > Enable experimental features by starting `dockerd` with the `--experimental`
 > flag or adding `"experimental": true` to the `daemon.json` file.
 
+### Environment variables
+
+For easy reference, the following list of environment variables are supported
+by the `dockerd` command line:
+
+* `DOCKER_DRIVER` The graph driver to use.
+* `DOCKER_NOWARN_KERNEL_VERSION` Prevent warnings that your Linux kernel is
+  unsuitable for Docker.
+* `DOCKER_RAMDISK` If set this will disable 'pivot_root'.
+* `DOCKER_TMPDIR` Location for temporary Docker files.
+* `MOBY_DISABLE_PIGZ` Do not use [`unpigz`](https://linux.die.net/man/1/pigz) to
+  decompress layers in parallel when pulling images, even if it is installed.
+
 ## Examples
 
 ### Daemon socket option