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Updated lxc module to remove the clone state

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The clone state was removed in favor of making the module more
declarative. This change was done in response to review in PR #328
from @bcoca.

In the commit new examples were created on how this feature works.
This commit is contained in:
Kevin Carter 2015-05-13 21:20:05 -05:00
parent 9800126a6e
commit fd0c21df27
1 changed files with 125 additions and 104 deletions
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229
cloud/lxc/lxc_container.py
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@ -156,12 +156,12 @@ options:
- restarted
- absent
- frozen
- clone
description:
- Define the state of a container. If you use clone the container
will be stopped while the clone operation is happening and upon
completion of the clone the original container state will be
restored.
- Define the state of a container. If you clone a container using
`clone_name` the newly cloned container created in a stopped state.
The running container will be stopped while the clone operation is
happening and upon completion of the clone the original container
state will be restored.
required: false
default: started
container_config:
@ -225,6 +225,7 @@ EXAMPLES = """
- name: Create filesystem container
lxc_container:
name: test-container-config
backing_store: dir
container_log: true
template: ubuntu
state: started
@ -238,7 +239,7 @@ EXAMPLES = """
# Create an lvm container, run a complex command in it, add additional
# configuration to it, create an archive of it, and finally leave the container
# in a frozen state. The container archive will be compressed using bzip2
- name: Create an lvm container
- name: Create a frozen lvm container
lxc_container:
name: test-container-lvm
container_log: true
@ -263,14 +264,6 @@ EXAMPLES = """
- name: Debug info on container "test-container-lvm"
debug: var=lvm_container_info
- name: Get information on a given container.
lxc_container:
name: test-container-config
register: config_container_info
- name: debug info on container "test-container"
debug: var=config_container_info
- name: Run a command in a container and ensure its in a "stopped" state.
lxc_container:
name: test-container-started
@ -285,19 +278,19 @@ EXAMPLES = """
container_command: |
echo 'hello world.' | tee /opt/frozen
- name: Start a container.
- name: Start a container
lxc_container:
name: test-container-stopped
state: started
- name: Run a command in a container and then restart it.
- name: Run a command in a container and then restart it
lxc_container:
name: test-container-started
state: restarted
container_command: |
echo 'hello world.' | tee /opt/restarted
- name: Run a complex command within a "running" container.
- name: Run a complex command within a "running" container
lxc_container:
name: test-container-started
container_command: |
@ -317,7 +310,10 @@ EXAMPLES = """
archive: true
archive_path: /opt/archives
- name: Create an overlayfs container
# Create a container using overlayfs, create an archive of it, create a
# snapshot clone of the container and and finally leave the container
# in a frozen state. The container archive will be compressed using gzip.
- name: Create an overlayfs container archive and clone it
lxc_container:
name: test-container-overlayfs
container_log: true
@ -325,40 +321,42 @@ EXAMPLES = """
state: started
backing_store: overlayfs
template_options: --release trusty
- name: Clone a container
lxc_container:
name: test-container-overlayfs
clone_name: test-container-clone
state: clone
- name: Clone a container using snapshot.
lxc_container:
name: test-container-overlayfs
clone_name: test-container-overlayfs-clone
backing_store: overlayfs
clone_snapshot: true
state: clone
clone_name: test-container-overlayfs-clone-snapshot
archive: true
archive_compression: gzip
register: clone_container_info
- name: debug info on container "test-container"
debug: var=clone_container_info
- name: Clone a container using snapshot
lxc_container:
name: test-container-overlayfs-clone-snapshot
backing_store: overlayfs
clone_name: test-container-overlayfs-clone-snapshot2
clone_snapshot: true
- name: Create a new container and clone it
lxc_container:
name: test-container-new-overlayfs
clone_name: test-container-new-overlayfs-clone
backing_store: overlayfs
clone_snapshot: true
state: clone
name: test-container-new-archive
backing_store: dir
clone_name: test-container-new-archive-clone
- name: Create a new container, clone it, and archive
- name: Archive and clone a container then destroy it
lxc_container:
name: test-container-new-overlayfs
clone_name: test-container-new-overlayfs-clone
backing_store: overlayfs
clone_snapshot: true
state: clone
name: test-container-new-archive
state: absent
clone_name: test-container-new-archive-destroyed-clone
archive: true
archive_compression: gzip
- name: Destroy a container.
- name: Start a cloned container.
lxc_container:
name: test-container-new-archive-destroyed-clone
state: started
- name: Destroy a container
lxc_container:
name: "{{ item }}"
state: absent
@ -369,8 +367,12 @@ EXAMPLES = """
- test-container-lvm
- test-container-config
- test-container-overlayfs
- test-container-clone
- test-container-overlayfs-clone
- test-container-overlayfs-clone-snapshot
- test-container-overlayfs-clone-snapshot2
- test-container-new-archive
- test-container-new-archive-clone
- test-container-new-archive-destroyed-clone
"""
@ -518,18 +520,16 @@ def create_script(command):
f.close()
# Ensure the script is executable.
os.chmod(script_file, 0755)
os.chmod(script_file, 1755)
# Get temporary directory.
tempdir = tempfile.gettempdir()
# Output log file.
stdout = path.join(tempdir, 'lxc-attach-script.log')
stdout_file = open(stdout, 'ab')
stdout_file = open(path.join(tempdir, 'lxc-attach-script.log'), 'ab')
# Error log file.
stderr = path.join(tempdir, 'lxc-attach-script.err')
stderr_file = open(stderr, 'ab')
stderr_file = open(path.join(tempdir, 'lxc-attach-script.err'), 'ab')
# Execute the script command.
try:
@ -561,6 +561,7 @@ class LxcContainerManagement(object):
self.container_name = self.module.params['name']
self.container = self.get_container_bind()
self.archive_info = None
self.clone_info = None
def get_container_bind(self):
return lxc.Container(name=self.container_name)
@ -735,7 +736,7 @@ class LxcContainerManagement(object):
self._container_startup()
self.container.freeze()
def _clone(self, count=0):
def _container_create_clone(self):
"""Clone a new LXC container from an existing container.
This method will clone an existing container to a new container using
@ -751,66 +752,51 @@ class LxcContainerManagement(object):
state.
"""
self.check_count(count=count, method='clone')
if self._container_exists(container_name=self.container_name):
# Ensure that the state of the original container is stopped
container_state = self._get_state()
if container_state != 'stopped':
self.state_change = True
self.container.stop()
# Ensure that the state of the original container is stopped
container_state = self._get_state()
if container_state != 'stopped':
self.state_change = True
self.container.stop()
build_command = [
self.module.get_bin_path('lxc-clone', True),
]
build_command = [
self.module.get_bin_path('lxc-clone', True),
]
build_command = self._add_variables(
variables_dict=self._get_vars(
variables=LXC_COMMAND_MAP['clone']['variables']
),
build_command=build_command
)
build_command = self._add_variables(
variables_dict=self._get_vars(
variables=LXC_COMMAND_MAP['clone']['variables']
),
build_command=build_command
)
# Load logging for the instance when creating it.
if self.module.params.get('clone_snapshot') in BOOLEANS_TRUE:
build_command.append('--snapshot')
# Load logging for the instance when creating it.
if self.module.params.get('clone_snapshot') in BOOLEANS_TRUE:
build_command.append('--snapshot')
# Check for backing_store == overlayfs if so force the use of snapshot
# If overlay fs is used and snapshot is unset the clone command will
# fail with an unsupported type.
elif self.module.params.get('backing_store') == 'overlayfs':
build_command.append('--snapshot')
rc, return_data, err = self._run_command(build_command)
if rc != 0:
message = "Failed executing lxc-clone."
self.failure(
err=err, rc=rc, msg=message, command=' '.join(
build_command
)
rc, return_data, err = self._run_command(build_command)
if rc != 0:
message = "Failed executing lxc-clone."
self.failure(
err=err, rc=rc, msg=message, command=' '.join(
build_command
)
else:
self.state_change = True
# Restore the original state of the origin container if it was
# not in a stopped state.
if container_state == 'running':
self.container.start()
elif container_state == 'frozen':
self.container.start()
self.container.freeze()
# Change the container name context to the new cloned container
# This enforces that the state of the new cloned container will be
# "stopped".
self.state = 'stopped'
self.container_name = self.module.params['clone_name']
self.container = self.get_container_bind()
# Return data
self._execute_command()
# Perform any configuration updates
self._config()
# Check if the container needs to have an archive created.
self._check_archive()
)
else:
self._create()
count += 1
self._clone(count)
self.state_change = True
# Restore the original state of the origin container if it was
# not in a stopped state.
if container_state == 'running':
self.container.start()
elif container_state == 'frozen':
self.container.start()
self.container.freeze()
return True
def _create(self):
"""Create a new LXC container.
@ -965,6 +951,23 @@ class LxcContainerManagement(object):
'archive': self._container_create_tar()
}
def _check_clone(self):
"""Create a compressed archive of a container.
This will store archive_info in as self.archive_info
"""
clone_name = self.module.params.get('clone_name')
if clone_name:
if not self._container_exists(container_name=clone_name):
self.clone_info = {
'cloned': self._container_create_clone()
}
else:
self.clone_info = {
'cloned': False
}
def _destroyed(self, timeout=60):
"""Ensure a container is destroyed.
@ -979,6 +982,9 @@ class LxcContainerManagement(object):
# Check if the container needs to have an archive created.
self._check_archive()
# Check if the container is to be cloned
self._check_clone()
if self._get_state() != 'stopped':
self.state_change = True
self.container.stop()
@ -1028,6 +1034,9 @@ class LxcContainerManagement(object):
# Check if the container needs to have an archive created.
self._check_archive()
# Check if the container is to be cloned
self._check_clone()
else:
self._create()
count += 1
@ -1055,6 +1064,9 @@ class LxcContainerManagement(object):
# Check if the container needs to have an archive created.
self._check_archive()
# Check if the container is to be cloned
self._check_clone()
else:
self._create()
count += 1
@ -1082,6 +1094,9 @@ class LxcContainerManagement(object):
# Check if the container needs to have an archive created.
self._check_archive()
# Check if the container is to be cloned
self._check_clone()
else:
self._create()
count += 1
@ -1122,6 +1137,9 @@ class LxcContainerManagement(object):
# Check if the container needs to have an archive created.
self._check_archive()
# Check if the container is to be cloned
self._check_clone()
else:
self._create()
count += 1
@ -1581,6 +1599,9 @@ class LxcContainerManagement(object):
if self.archive_info:
outcome.update(self.archive_info)
if self.clone_info:
outcome.update(self.clone_info)
self.module.exit_json(
changed=self.state_change,
lxc_container=outcome