这篇文章主要介绍了rexray在CentOS上不能创建ceph rbd的docker volume问题怎么办,具有一定借鉴价值,感兴趣的朋友可以参考下,希望大家阅读完这篇文章之后大有收获,下面让小编带着大家一起了解一下。
我们通过docker的rexray插件来创建ceph rbd设备的docker volume,但总提示创建失败。
# docker volume create --driver=rexray --opt=size=5 --name=cephrbd-book Error response from daemon: create test_cephrbd_volume: VolumeDriver.Create: {"Error":"Failed to create new volume"}
OS版本:
# lsb_release -a LSB Version: :core-4.1-amd64:core-4.1-noarch Distributor ID: CentOS Description: CentOS Linux release 7.4.1708 (Core) Release: 7.4.1708 Codename: Core
Ceph版本:
# ceph version ceph version 0.94.5
rexray版本:
# rexray version REX-Ray ------- Binary: /usr/bin/rexray Flavor: client+agent+controller SemVer: 0.9.0 OsArch: Linux-x86_64 Branch: (detached from 2a7458d Commit: 2a7458dd90a79c673463e14094377baf9fc8695e Formed: Wed, 26 Jul 2017 14:35:37 CST libStorage ---------- SemVer: 0.6.0 OsArch: Linux-x86_64 Branch: (detached from fa055d6 Commit: fa055d6da595602715bdfd5541b4aa6d4dcbcbd9 Formed: Wed, 26 Jul 2017 14:35:11 CST
之前我们在ubuntu 16.04的环境中,也搭建过docker+ceph+rexray的环境,使用docker命令创建volume并没有报错。正常的流程是:
1. 创建docker volume:rexray会使用rbd create命令创建一个rbd设备; 2. 使用该volume创建docker 容器:rexray会将rbd 设备map到docker host上成为一个/dev/rbd设备,再使用mount命令将/dev/rbd设备挂载到/var/lib/libstorage/volumes/目录,供容器使用; 3. 删除该容器时:先umount掉/dev/rbd设备在/var/lib/libstorage/volumes/目录的挂载,再rbd unmap掉rbd设备在docker host上的映射; 4. 删除docker volume:rexray会使用rbd rm命令删除该rbd设备;
在我们的实际使用情况中,发现只有第一步会出错,后面的三步都并未出现任何异常。而且,如果我们不使用docker volume create命令创建rbd设备,而是直接使用“rbd create”命令来创建rbd设备,也并未出现任何错误,且该rbd设备也可以正常使用。这是很奇怪的一个地方。
查看docker日志,也只是提示“Failed to create new volume”,并没有其他有用的信息。
# journalctl -xu docker ... Jan 22 10:45:13 dcos-agent2 dockerd[66886]: time="2018-01-22T10:45:13.937645601+08:00" level=error msg="Handler for POST /v1.29/volumes/create returned error: create cephrbd-book: VolumeDri ver.Create: {\"Error\":\"Failed to create new volume\"}\n"
既然docker中没有更有价值的日志,那么就尝试看下rexray的日志,这里需要打开rexray的debug选项(打开方法参考),从而可以看到更多的日志。
# vim /var/log/rexray/rexray.log ... time="2018-01-19T19:12:32+08:00" level=info msg=" -------------------------- HTTP REQUEST (CLIENT) -------------------------" time="2018-01-19T19:12:32+08:00" level=info msg=" GET /volumes/rbd?attachments=0 HTTP/1.1" time="2018-01-19T19:12:32+08:00" level=info msg=" Host: libstorage-server" time="2018-01-19T19:12:32+08:00" level=info msg=" Libstorage-Instanceid: rbd=109.105.115.73" time="2018-01-19T19:12:32+08:00" level=info msg=" Libstorage-Localdevices: rbd=" time="2018-01-19T19:12:32+08:00" level=info msg=" Libstorage-Tx: txID=b9fb044b-d47a-4ac5-7533-5824b8dc737a, txCR=1516360352" time="2018-01-19T19:12:32+08:00" level=info msg=" " time="2018-01-19T19:12:33+08:00" level=info time="2018-01-19T19:12:33+08:00" level=info msg=" -------------------------- HTTP RESPONSE (CLIENT) -------------------------" time="2018-01-19T19:12:33+08:00" level=info msg=" HTTP/1.1 200 OK" time="2018-01-19T19:12:33+08:00" level=info msg=" Content-Length: 228" time="2018-01-19T19:12:33+08:00" level=info msg=" Content-Type: application/json" time="2018-01-19T19:12:33+08:00" level=info msg=" Date: Fri, 19 Jan 2018 11:12:33 GMT" time="2018-01-19T19:12:33+08:00" level=info msg=" Libstorage-Servername: jade-chopper-ky" time="2018-01-19T19:12:33+08:00" level=info msg=" " time="2018-01-19T19:12:33+08:00" level=info msg=" {" time="2018-01-19T19:12:33+08:00" level=info msg=" \"rbd.test_fs_device2\": {" time="2018-01-19T19:12:33+08:00" level=info msg=" \"name\": \"test_fs_device2\"," time="2018-01-19T19:12:33+08:00" level=info msg=" \"size\": 16," time="2018-01-19T19:12:33+08:00" level=info msg=" \"id\": \"rbd.test_fs_device2\"," time="2018-01-19T19:12:33+08:00" level=info msg=" \"type\": \"rbd\"" time="2018-01-19T19:12:33+08:00" level=info msg=" }," time="2018-01-19T19:12:33+08:00" level=info msg=" \"rbd.test_majk\": {" time="2018-01-19T19:12:33+08:00" level=info msg=" \"name\": \"test_majk\"," time="2018-01-19T19:12:33+08:00" level=info msg=" \"id\": \"rbd.test_majk\"," time="2018-01-19T19:12:33+08:00" level=info msg=" \"type\": \"rbd\"" time="2018-01-19T19:12:33+08:00" level=info msg=" }" time="2018-01-19T19:12:33+08:00" level=info msg=" }" time="2018-01-19T19:12:33+08:00" level=info time="2018-01-19T19:12:33+08:00" level=info msg=" -------------------------- HTTP REQUEST (CLIENT) -------------------------" time="2018-01-19T19:12:33+08:00" level=info msg=" POST /volumes/rbd HTTP/1.1" time="2018-01-19T19:12:33+08:00" level=info msg=" Host: libstorage-server" time="2018-01-19T19:12:33+08:00" level=info msg=" Libstorage-Instanceid: rbd=109.105.115.73" time="2018-01-19T19:12:33+08:00" level=info msg=" Libstorage-Localdevices: rbd=" time="2018-01-19T19:12:33+08:00" level=info msg=" Libstorage-Tx: txID=b1565614-1b5f-4de2-5756-b74fb99887aa, txCR=1516360353" time="2018-01-19T19:12:33+08:00" level=info msg=" " time="2018-01-19T19:12:33+08:00" level=info msg=" {\"name\":\"cephrbd-book\",\"availabilityZone\":\"\",\"iops\":0,\"size\":5,\"type\":\"\",\"opts\":{\"size\":\"5\"}}" time="2018-01-19T19:12:33+08:00" level=info time="2018-01-19T19:12:33+08:00" level=info msg=" -------------------------- HTTP RESPONSE (CLIENT) -------------------------" time="2018-01-19T19:12:33+08:00" level=info msg=" HTTP/1.1 500 Internal Server Error" time="2018-01-19T19:12:33+08:00" level=info msg=" Content-Length: 319" time="2018-01-19T19:12:33+08:00" level=info msg=" Content-Type: application/json" time="2018-01-19T19:12:33+08:00" level=info msg=" Date: Fri, 19 Jan 2018 11:12:33 GMT" time="2018-01-19T19:12:33+08:00" level=info msg=" Libstorage-Servername: jade-chopper-ky" time="2018-01-19T19:12:33+08:00" level=info msg=" " time="2018-01-19T19:12:33+08:00" level=info msg=" {" time="2018-01-19T19:12:33+08:00" level=info msg=" \"message\": \"Failed to create new volume\"," time="2018-01-19T19:12:33+08:00" level=info msg=" \"status\": 500," time="2018-01-19T19:12:33+08:00" level=info msg=" \"error\": {" time="2018-01-19T19:12:33+08:00" level=info msg=" \"driverName\": \"rbd\"," time="2018-01-19T19:12:33+08:00" level=info msg=" \"inner\": {" time="2018-01-19T19:12:33+08:00" level=info msg=" \"inner\": \"Error running command: [rbd: strict_strtoll: garbage at end of string. got: '5G'\\n]\"," time="2018-01-19T19:12:33+08:00" level=info msg=" \"msg\": \"unable to create rbd\"" time="2018-01-19T19:12:33+08:00" level=info msg=" }," time="2018-01-19T19:12:33+08:00" level=info msg=" \"opts.Size\": 5," time="2018-01-19T19:12:33+08:00" level=info msg=" \"volumeName\": \"cephrbd-book\"" time="2018-01-19T19:12:33+08:00" level=info msg=" }" time="2018-01-19T19:12:33+08:00" level=info msg=" }"
通过日志可以看到,每次发送docker volume create命令时,实际发送了两次http请求,第一次是列出当前的rbd设备,第二次才是发出post请求来创建一个rbd设备。而这里的日志,则给出了更多的信息“rbd: strict_strtoll: garbage at end of string. got: '5G'”。也就是说,很可能就是在rexray调用rbd create命令时发生了错误。这里,我们打开rexray源码继续跟踪,具体的源码文件为rexray/blob/master/libstorage/drivers/storage/rbd/utils/utils.go。
//RBDCreate creates a new RBD volume on the cluster func RBDCreate( ctx types.Context, pool *string, image *string, sizeGB *int64, objectSize *string, features []*string) error { cmd := exec.Command( rbdCmd, "create", poolOpt, *pool, "--object-size", *objectSize, "--size", strconv.FormatInt(*sizeGB, 10)+"G", ) for _, feature := range features { cmd.Args = append(cmd.Args, "--image-feature") cmd.Args = append(cmd.Args, *feature) } cmd.Args = append(cmd.Args, *image) _, _, err := RunCommand(ctx, cmd) if err != nil { return goof.WithError("unable to create rbd", err) } return nil }
根据上面的代码可以大致看出,rexray就是直接调用rbd create命令来创建rbd设备,和我们直接调用命令不同的是它这里是把rbd的大小转化成GB,然后再字符串拼接了一个“G”。这里我们就按照它这里的方法,组装了一个新的rbd命令,然后在CentOS上测试:
# rbd create cephrbd-test --size 5G rbd: strict_strtoll: garbage at end of string. got: '5G'
果然,还是报错了,我们再使用该命令在ubuntu上测试:
# rbd create cephrbd-test --size 5G
在ubuntu上运行,没有报错。同一条命令,在不同的环境下结果不同。那么最大的可能就是rbd(ceph)的版本不一致了。在ubuntu下获取ceph版本。
# ceph version ceph version 10.2.7
而CentOS上默认安装的ceph版本只是0.94.5(Hammer版),而Ubuntu上默认安装的却是更高的10.2.7(jewel版本)。而0.94.5 ceph版本的rbd命令无法解析“G”,“M”等描述rbd大小的参数。这就是问题出现的原因。
在CentOS上安装更新的Ceph版本(jewel或更新的版本)即可。
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