It's ambiguous to say that `ENV` is _functionally equivalent to prefixing the command with `<key>=<value>`_. `ENV` sets the environment for all future commands, but `RUN` can take chained commands like `RUN foo=bar bash -c 'echo $foo' && bash -c 'echo $foo $bar'`. Users with a solid understanding of `exec` may grok this without confusion, but less experienced users may need this distinction.
Signed-off-by: Michael A. Smith <msmith3@ebay.com>
Improve Environment Handling Descriptions
- Link `ENV` and `Environment Replacement`
- Improve side-effects of `ENV` text
- Rearrange avoiding side effects text
Signed-off-by: Michael A. Smith <msmith3@ebay.com>
Reflow change in commit 195f3a3f removed newlines in the config format.
This change reverts the sample config to the original formatting, which
matches the actual config format of a `awsconfig` file.
Signed-off-by: Katie McLaughlin <katie@glasnt.com>
This modifies the "docker help" text so that it is no wider than 80 chars
and each description fits on one line. This will also try to use ~ when
possible
Added a test to make sure we don't go over 80 chars again.
Added a test to make sure we use ~
Applied rules/tests to all docker commands - not just main help text
Closes#10214
Signed-off-by: Doug Davis <dug@us.ibm.com>
The docs around COPY/ADD already mentioned that it will do a relative
copy/add based on WORKDIR, so that part is already ok. Just needed to
tweak the WORKDIR section since w/o mentioning COPY/ADD it can be misleading.
Noticed by @phemmer
Signed-off-by: Doug Davis <dug@us.ibm.com>
See #10141 for more info, but the main point of this is to make sure
that if you do "docker run -e FOO ..." that FOO from the current env
is passed into the container. This means that if there's a value, its
set. But it also means that if FOO isn't set then it should be unset in
the container too - even if it has to remove it from the env. So,
unset HOSTNAME
docker run -e HOSTNAME busybox env
should _NOT_ show HOSTNAME in the list at all
Closes#10141
Signed-off-by: Doug Davis <dug@us.ibm.com>
Fixes#9960
This adds the output of a "Backing Filesystem:" entry to `docker info`
to overlay, aufs, and devicemapper graphdrivers. The default list
includes a fairly complete list of common filesystem names from
linux/include/uapi/linux/magic.h, but if the backing filesystem is not
recognized, the code will simply show "<unknown>"
Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com>
The documentation on `docker export` doesn't mention that
data in volumes is not included in the export.
This adds a note that volumes are not part of the export
and refers to the "Backup, restore, or migrate data volumes"
to give the user some pointers.
Relates to https://github.com/docker/docker/issues/10095
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Add a --readonly flag to allow the container's root filesystem to be
mounted as readonly. This can be used in combination with volumes to
force a container's process to only write to locations that will be
persisted. This is useful in many cases where the admin controls where
they would like developers to write files and error on any other
locations.
Closes#7923Closes#8752
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
We want to be able to use container without the PID namespace. We basically
want containers that can manage the host os, which I call Super Privileged
Containers. We eventually would like to get to the point where the only
namespace we use is the MNT namespace to bring the Apps userspace with it.
By eliminating the PID namespace we can get better communication between the
host and the clients and potentially tools like strace and gdb become easier
to use. We also see tools like libvirtd running within a container telling
systemd to place a VM in a particular cgroup, we need to have communications of the PID.
I don't see us needing to share PID namespaces between containers, since this
is really what docker exec does.
So currently I see us just needing docker run --pid=host
Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)
Add a check to make sure Dockerfile is in the build context
Add docs and a testcase
Make -f relative to current dir, not build context
Signed-off-by: Doug Davis <dug@us.ibm.com>
If .dockerignore mentions either then the client will send them to the
daemon but the daemon will erase them after the Dockerfile has been parsed
to simulate them never being sent in the first place.
an events test kept failing for me so I tried to fix that too
Closes#8330
Signed-off-by: Doug Davis <dug@us.ibm.com>
as noted in https://github.com/boot2docker/boot2docker/issues/690
Signed-off-by: Sven Dowideit <SvenDowideit@docker.com>
Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)
--help and help are successful commands so output should not go to error.
QE teams have requested this change, also users doing docker help | less
or docker run --help | less would expect this to work.
Usage statement should only be printed when the user asks for it.
Errors should print error message and then suggest the docker COMMAND --help
command to see usage information.
The current behaviour causes the user to have to search for the error message
and sometimes scrolls right off the screen. For example a error on a
"docker run" command is very difficult to diagnose.
Finally erros should always exit with a non 0 exit code, if the user
makes a CLI error.
Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)
Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>
Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Signed-off-by: Sven Dowideit <SvenDowideit@docker.com>
Moved Tianon's PR from: https://github.com/docker/docker/pull/7870
on top of the latest code
Closes: #3936
Signed-off-by: Andrew Page <admwiggin@gmail.com>
Signed-off-by: Doug Davis <dug@us.ibm.com>
Sven Dowideit
Michael A. Smith
Alexander Morozov
Katie McLaughlin
Qiang Huang
Doug Davis
Chen Hanxiao
Michael Crosby
Sven Dowideit
Jessica Frazelle
Lei Jitang
Sebastiaan van Stijn
Arnaud Porterie
Liang-Chi Hsieh
Phil Estes
Nathan Hsieh
Dan Walsh
Srini Brahmaroutu
Andreas Köhler
Malte Janduda
Jan Koprowski
Christian Stefanescu
Fred Lifton