Docker 1.8.0 RC1 发布，更丰富的 Dockerfile 语法
## 1.8.0### Distribution
+ Trusted pull, push and build (disabled by default)
* Make tar layers deterministic between registries
* Don't allow deleting the image of running containers
* Check if a tag name to load is a valid digest
* Allow one character repository names
* Add a more accurate error description for invalid tag name
* Make build cache ignore mtime
### Cli
+ Add support for DOCKER_CONFIG/--config to specify config file dir
+ Add --type flag for docker inspect command
+ Add formatting options to `docker ps` with `--format`
+ Replace `docker -d` with new subcommand `docker daemon`
* Zsh completion updates and improvements
* Add some missing events to bash completion
* Support daemon urls with base paths in `docker -H`
* Validate status= filter to docker ps
* Display when a container is in --net=host in docker ps
* Extend docker inspect to export image metadata related to graph driver
* Restore --default-gateway{,-v6} daemon options
* Add missing unpublished ports in docker ps
* Allow duration strings in `docker events` as --since/--until
* Expose more mounts information in `docker inspect`
### Runtime
+ Add new Fluentd logging driver
+ Allow `docker import` to load from local files
+ Add logging driver for GELF via UDP
+ Allow to copy files from host to containers with `docker cp`
+ Promote volume drivers from experimental to master
+ Add rollover log driver, and --log-driver-opts flag
+ Add memory swappiness tuning options
* Remove cgroup read-only flag when privileged
* Make /proc, /sys, & /dev readonly for readonly containers
* Add cgroup bind mount by default
* Overlay: Export metadata for container and image in `docker inspect`
* Devicemapper: external device activation
* Devicemapper: Compare uuid of base device on startup
* Remove RC4 from the list of registry cipher suites
* Add syslog-facility option
* LXC execdriver compatibility with recent LXC versions
### Plugins
* Separate plugin sockets and specs locations
* Allow TLS connections to plugins
### Bug fixes
- Add missing 'Names' field to /containers/json API output
- Make `docker rmi --dangling` safe when pulling
- Devicemapper: Change default basesize to 100G
- Go Scheduler issue with sync.Mutex and gcc
- Fix issue where Search API endpoint would panic due to empty AuthConfig
- Set image canonical names correctly
- Check dockerinit only if lxc driver is used
- Fix ulimit usage of nproc
- Always attach STDIN if -i,--interactive is specified
- Show error messages when saving container state fails
- Fixed incorrect assumption on --bridge=none treated as disable network
- Check for invalid port specifications in host configuration
- Fix endpoint leave failure for --net=host mode
- Fix goroutine leak in the stats API if the container is not running
- Check for apparmor file before reading it
- Fix DOCKER_TLS_VERIFY being ignored
- Set umask to the default on startup
- Correct the message of pause and unpause a non-running container
- Adjust disallowed CpuShares in container creation
- ZFS: correctly apply selinux context
- Display empty string instead of when IP opt is nil
- `docker kill` returns error when container is not running
- Fix COPY/ADD quoted/json form
- Fix goroutine leak on logs -f with no output
- Remove panic in nat package on invalid hostport
- Fix container linking in Fedora 22
- Fix error caused using default gateways outside of the allocated range
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