golang开源分布式文件系统weed-fs的安装与运用

1.安装配置golang开发环境

       Go是Google开发的一种编译型，可平行化，并具有垃圾回收功能的编程语言，本文写作时，go的最新版本是1.4.2，可到http://www.golangtc.com/download去下载go1.4.2.linux-amd64.tar.gz，下载后将压缩包上传并解压到指定的目录下（例：/tmp/chengxf/go）。

        配置环境变量，编辑/etc/profile文件，添加如下内容：

        GOHOME=/tmp/chengxf

        export GOROOT=$GOHOME/go

        export GOPATH=$GOHOME/gopath

        export PATH=$PATH:$GOHOME/go/bin

        export PATH=$PATH:$GOPATH/bin

        保存退出，执行source
/etc/profile重新加载环境变量后，执行go version，若能正常显示go的版本信息，则配置成功。

2.下载并安装weed-fs

        weed-fs又称为seaweed-fs，是一个简单且高性能的分布式存储系统，他有如下功能：

 
      a. 存储海量文件

 
      b. 能快速访问存储的文件

 
      参考weed-fs的官网https://github.com/chrislusf/seaweedfs的installation guide安装weed-fs，见下图：

 
      


 
      执行go get github.com/chrislusf/seaweedfs/go/weed命令后，将下载并编译weed-fs，生成的可执行文件weed放在$GOPATH/bin目录，源码存放在$GOPATH/src目录，由于在国内一些网站被墙，所以可能会出现以下错误：

 
      root@ubuntu:/tmp/chengxf# go get github.com/chrislusf/seaweedfs/go/weed
        package github.com/chrislusf/seaweedfs/go/weed
 
      imports bazil.org/fuse
 
      imports bazil.org/fuse/fs
 
      imports golang.org/x/net/context: unrecognized import path "golang.org/x/net/context"
        # cd .;git
clone https://code.google.com/p/go-decimal-inf.exp /tmp/chengxf/gopath/src/speter.net/go/exp/math/dec/inf
        Cloning into '/tmp/chengxf/gopath/src/speter.net/go/exp/math/dec/inf'...
        error: Failed to connect to 2404:6800:400a:805::200e:
Network is unreachable while accessing https://code.google.com/p/go-decimal-inf.exp/info/refs         fatal: HTTP request failed
        package github.com/chrislusf/seaweedfs/go/weed
 
      imports bazil.org/fuse
 
      imports bazil.org/fuse/fs
 
      imports github.com/boltdb/bolt
 
      imports github.com/chrislusf/raft
 
      imports github.com/gogo/protobuf/proto
 
      imports github.com/dgrijalva/jwt-go
 
      imports github.com/gocql/gocql
 
      imports github.com/golang/groupcache/lru
 
      imports github.com/golang/snappy/snappy
 
      imports speter.net/go/exp/math/dec/inf: exit status 128
        package github.com/chrislusf/seaweedfs/go/weed
 
      imports bazil.org/fuse
 
      imports bazil.org/fuse/fs
 
      imports github.com/boltdb/bolt
 
      imports github.com/chrislusf/raft
 
      imports github.com/gogo/protobuf/proto
 
      imports github.com/dgrijalva/jwt-go
 
      imports github.com/gocql/gocql
 
      imports github.com/golang/groupcache/lru
 
      imports github.com/golang/snappy/snappy
 
      imports github.com/golang/protobuf/proto
 
      imports github.com/syndtr/goleveldb/leveldb
 
      imports github.com/syndtr/goleveldb/leveldb/util
 
      imports github.com/syndtr/gosnappy/snappy
 
      imports gopkg.in/redis.v2
 
      imports gopkg.in/bufio.v1
 
      imports github.com/disintegration/imaging
 
      imports golang.org/x/image/bmp: unrecognized import path "golang.org/x/image/bmp"
        package github.com/chrislusf/seaweedfs/go/weed
 
      imports bazil.org/fuse
 
      imports bazil.org/fuse/fs
 
      imports github.com/boltdb/bolt
 
      imports github.com/chrislusf/raft
 
      imports github.com/gogo/protobuf/proto
 
      imports github.com/dgrijalva/jwt-go
 
      imports github.com/gocql/gocql
 
      imports github.com/golang/groupcache/lru
 
      imports github.com/golang/snappy/snappy
 
      imports github.com/golang/protobuf/proto
 
      imports github.com/syndtr/goleveldb/leveldb
 
      imports github.com/syndtr/goleveldb/leveldb/util
 
      imports github.com/syndtr/gosnappy/snappy
 
      imports gopkg.in/redis.v2
 
      imports gopkg.in/bufio.v1
 
      imports github.com/disintegration/imaging
 
      imports golang.org/x/image/tiff: unrecognized import path "golang.org/x/image/tiff"
        root@ubuntu:/tmp/chengxf# 

 
      首先上面的unrecognized import path “imports
golang.org/x/xxx/xxx”，可以手动去https://github.com/golang上下载相应的包，放置与/tmp/chengxf/gopath/src的相应子目录下，再次执行后，发现只剩如下错误：

 
      root@ubuntu:/tmp/chengxf# go get github.com/chrislusf/seaweedfs/go/weed

        # cd .; git clone https://code.google.com/p/go-decimal-inf.exp /tmp/chengxf/gopath/src/speter.net/go/exp/math/dec/inf
        Cloning into '/tmp/chengxf/gopath/src/speter.net/go/exp/math/dec/inf'...
        error: Failed to connect to 2404:6800:4005:80b::200e:
Network is unreachable while accessing https://code.google.com/p/go-decimal-inf.exp/info/refs         fatal: HTTP request failed
        package speter.net/go/exp/math/dec/inf:
exit status 128
        root@ubuntu:/tmp/chengxf#

 
      上面是获取code.google.com上的资源出现错误，可以手动去https://github.com/go-inf/inf/tree/master下载源码包，并解压至/tmp/chengxf/gopath/src/speter.net/go/exp/math/dec/inf目录下，再次执行go
get github.com/chrislusf/seaweedfs/go/weed又报错：

 
      root@ubuntu:/tmp/chengxf/gopath/src/speter.net/go/exp/math/dec/inf# go get github.com/chrislusf/seaweedfs/go/weed

../../../../../../github.com/gocql/gocql/helpers.go:13:2: code in directory /tmp/chengxf/gopath/src/speter.net/go/exp/math/dec/inf expects import "gopkg.in/inf.v0"

 
      好吧，我也不知道什么原因，总之我将/tmp/chengxf/gopath/src/speter.net/go/exp/math/dec/inf/dec.go文件中的”//
import "gopkg.in/inf.v0"“删除掉，然后再用go get github.com/chrislusf/seaweedfs/go/weed重新编译就好了。/tmp/chengxf/gopath/bin目录下生成了可执行文件weed。

3. 使用weed-fs存储和访问文件

        准备：在/tmp/chengxf目录下新建如下文件夹：mdata、vol1、vol2、input和output，并在input文件夹中新建测试文件a.txt和b.xml。

        启动master：weed master -mdir="/tmp/chengxf/mdata" -defaultReplication="001" -ip="10.124.69.235" -port=9334 &

        启动volume：weed volume -dir=/tmp/chengxf/vol1/ -mserver="10.124.69.235:9334" -ip="117.78.1.100" -ip.bind="10.124.69.235" -port=8081 -max=5 &

                               weed volume -dir=/tmp/chengxf/vol2/ -mserver="10.124.69.235:9334" -ip="117.78.1.100" -ip.bind="10.124.69.235" -port=8082 -max=5 &

        存储文件：weed upload -server="117.78.1.100:9334" -dir="/tmp/chengxf/input" -include=*.txt

        执行后返回文件fid：[{"fileName":"/tmp/chengxf/input/a.txt","fileUrl":"117.78.1.100:8081/1,01eb8f1e42","fid":"1,01eb8f1e42","size":44}]

        根据fid访问文件：weed download -server="117.78.1.100:9334" -dir="/tmp/chengxf/output" 1,01eb8f1e42

        执行后在/tmp/chengxf/output目录下发现a.txt文件

        测试机器是云服务器，117.78.1.100是公网IP，通过防火墙映射到内网机器10.124.69.235上的，不能直接绑定公网地址，所以采用ip.bind绑定内网地址来实现。