{"id":108,"date":"2013-05-12T11:02:05","date_gmt":"2013-05-12T03:02:05","guid":{"rendered":"http:\/\/www.datarelab.com\/blog\/?p=108"},"modified":"2013-05-12T11:02:05","modified_gmt":"2013-05-12T03:02:05","slug":"%e4%bd%bf%e7%94%a8qemu-img%e7%ae%a1%e7%90%86%e8%99%9a%e6%8b%9f%e6%9c%ba%e7%a3%81%e7%9b%98%e9%95%9c%e5%83%8f%ef%bc%88%e5%88%9b%e5%bb%ba%e8%99%9a%e6%8b%9f%e6%9c%ba%ef%bc%8c%e8%99%9a%e6%8b%9f%e6%9c%ba%e5","status":"publish","type":"post","link":"https:\/\/www.datarelab.com\/blog\/Technical_literature\/108.html","title":{"rendered":"\u4f7f\u7528Qemu-img\u7ba1\u7406\u865a\u62df\u673a\u78c1\u76d8\u955c\u50cf\uff08\u521b\u5efa\u865a\u62df\u673a\uff0c\u865a\u62df\u673a\u5feb\u7167\uff09"},"content":{"rendered":"

\u4e00\u53f0\u865a\u62df\u673a\u7684\u6838\u5fc3\u5c31\u662f\u4e00\u4e2a\u78c1\u76d8\u955c\u50cf\uff0c\u8fd9\u4e2a\u955c\u50cf\u53ef\u4ee5\u7406\u89e3\u6210\u865a\u62df\u673a\u7684\u78c1\u76d8\uff0c\u91cc\u9762\u6709\u865a\u62df\u673a\u7684\u64cd\u4f5c\u7cfb\u7edf\u548c\u9a71\u52a8\u7b49\u91cd\u8981\u6587\u4ef6\u3002\u672c\u6587\u4e3b\u8981\u4ecb\u7ecd\u521b\u5efa\u865a\u62df\u673a\u7684\u4e00\u822c\u8fc7\u7a0b\u3002<\/span><\/span><\/span><\/p>\n

\n\u521b\u5efa\u865a\u62df\u673a\u955c\u50cf<\/h2>\n

 <\/p>\n

\u8981\u5728\u4e00\u53f0host\u4e0a\u8dd1\u8d77\u4e00\u4e2a\u865a\u62df\u673a\u4e00\u822c\u9700\u8981\u4e24\u4e2a\u6b65\u9aa4\uff1a
\n<\/span><\/span><\/span><\/p>\n

\u7b2c\u4e00\u6b65\uff1a\u521b\u5efa\u865a\u62df\u673a\u955c\u50cf<\/span><\/span><\/span><\/p>\n

\n
qemu-img create<\/strong> -f raw \/images\/vm1.raw 8G<\/pre>\n<\/div>\n
qmeu-img\u521b\u5efa\u7684\u955c\u50cf\u662f\u4e00\u4e2a\u7a00\u758f\u6587\u4ef6\uff0c\u4e5f\u5c31\u662f\u8bf4\u521a\u521b\u5efa\u51fa\u6765\u7684\u6587\u4ef6\u5e76\u6ca1\u67098G\uff0c\u5b83\u4f1a\u968f\u7740\u6570\u636e\u7684\u589e\u591a\u6162\u6162\u589e\u52a0\uff0c\u76f4\u52308G<\/p>\n
 <\/p>\n
\u7b2c\u4e8c\u6b65\uff1a\u542f\u52a8\u865a\u62df\u673a<\/p>\n
\n
kvm<\/strong> \/imges\/vm1.raw<\/pre>\n<\/div>\n
\u8fd0\u884c\u7ed3\u679c: \u56e0\u4e3a\u955c\u50cf\u91cc\u9762\u6ca1\u6709\u4efb\u4f55\u5185\u5bb9\uff0c\u6240\u4ee5\u63d0\u793a\u627e\u4e0d\u5230\u53ef\u5f15\u5bfc\u8bbe\u5907\u3002<\/p>\n
\"\u70b9\u51fb\u67e5\u770b\u539f\u56fe\"<\/a><\/p>\n
 <\/p>\n
\u4f7f\u7528qemu-img\u7ba1\u7406\u955c\u50cf<\/h2>\n
\n
\n
 <\/h3>\n
qemu-img\u57fa\u672c\u547d\u4ee4<\/h3>\n
\n
 <\/p>\n
\u4e0a\u8282\u4ecb\u7ecd\u4e86\u4f7f\u7528qemu-img\u521b\u5efa\u955c\u50cf\uff0c\u8fd9\u4e00\u8282\u5c06\u4f1a\u4ecb\u7ecdqemu-img\u5728\u955c\u50cf\u7ba1\u7406\u4e0a\u7684\u5f3a\u5927\u529f\u80fd\u3002<\/p>\n
qemu-img\u6709\u5f88\u591a\u547d\u4ee4\uff0c\u5305\u62ec\u4e0b\u9762\u5e38\u7528\u7684\uff0c\u5f53\u7136qemu-img -h\u4f60\u61c2\u5f97\u3002<\/p>\n
\n
info<\/code><\/span><\/strong><\/dt>\n
\n
\u67e5\u770b\u955c\u50cf\u7684\u4fe1\u606f\n<\/p>\n<\/dd>\n<\/dl>\n
\n
\n
create<\/code><\/span><\/strong><\/dt>\n
\n
\u521b\u5efa\u955c\u50cf<\/p>\n<\/dd>\n
check<\/code><\/span><\/strong><\/dt>\n
\n
\u68c0\u67e5\u955c\u50cf<\/p>\n<\/dd>\n
convert<\/code><\/span><\/strong><\/dt>\n
\n
\u8f6c\u5316\u955c\u50cf\u7684\u683c\u5f0f\uff0c\uff08raw\uff0cqcow \u2026\u2026\uff09<\/p>\n<\/dd>\n
snapshot<\/code><\/span><\/strong><\/dt>\n
\n
\u7ba1\u7406\u955c\u50cf\u7684\u5feb\u7167<\/p>\n<\/dd>\n
rebase<\/code><\/span><\/strong><\/dt>\n
\n
\u5728\u5df2\u6709\u7684\u955c\u50cf\u7684\u57fa\u7840\u4e0a\u521b\u5efa\u65b0\u7684\u955c\u50cf<\/p>\n<\/dd>\n
resize<\/code><\/span><\/strong><\/dt>\n
\n
\u589e\u52a0\u6216\u51cf\u5c0f\u955c\u50cf\u5927\u5c0f<\/p>\n<\/dd>\n
<\/dt>\n<\/dl>\n
 \u521b\u5efa\u955c\u50cf<\/strong><\/h3>\n
\n
 <\/p>\n
\n
qemu-img create<\/strong> -f <fmt<\/span>> -o <options> <fname> <size><\/pre>\n<\/div>\n<\/div>\n
 \u4e3e\u4f8b\uff1a<\/p>\n
\n
qemu-img create<\/strong> -f raw -o size=4G \/images\/vm2.raw<\/pre>\n<\/div>\n
 <\/p>\n
\n
hzgatt@hzgatt:~\/<\/span>images$<\/span> ll<\/strong> total <\/span>0<\/span>-rw-r--r-- 1<\/span> hzgatt hzgatt 4<\/span>.0G  6\u6708 29<\/span> 14<\/span>:11<\/span> vm2.rawhzgatt@hzgatt:<\/span><\/span>~\/images$<\/span> ll -<\/strong>s<\/strong> total <\/span>0<\/span>0<\/span> -rw-r--r-- 1<\/span> hzgatt hzgatt 4<\/span>.0G  6\u6708 29<\/span> 14<\/span>:11<\/span> vm2.raw<\/span><\/pre>\n<\/div>\n
 <\/p>\n
\n
hzgatt@hzgatt:~\/images$<\/span> qemu-img info<\/span><\/strong> vm2.raw<\/strong> \r\nimage: vm2.raw<\/span>file<\/span> format: raw\r\nvirtual size: <\/span>4<\/span>.0G (4294967296<\/span> bytes)\r\ndisk size: <\/span>0<\/span><\/pre>\n<\/div>\n
 <\/p>\n
\u867d\u7136ls\u4e2d\u770b\u5230\u6587\u4ef6\u7684\u5927\u5c0f\u662f4G\uff0c\u4f46\u662f\u5b9e\u9645\u4e0a\u78c1\u76d8\u5927\u5c0f\u662f0\u3002\u8fd9\u5c31\u662f\u7a00\u758f\u6587\u4ef6<\/p>\n
 <\/p>\n
 <\/p>\n
\u8f6c\u5316<\/strong><\/h3>\n
\n
\u5c06\u4e00\u4e2a\u955c\u50cf\u6587\u4ef6\u8f6c\u5316\u4e3a\u53e6\u5916\u4e00\u79cd\u683c\u5f0f\uff0cqemu-img\u652f\u6301\u7684\u683c\u5f0f\u53ef\u4ee5\u770bqemu-img -h\u6700\u540e\u4e00\u884c\u3002<\/p>\n
\n
Supported formats: vvfat vpc vmdk vdi sheepdog rbd raw host_cdrom host_floppy host_device file<\/span> qed qcow2 qcow parallels nbd dmg tftp ftps ftp<\/span> https http cow cloop bochs blkverify blkdebug<\/pre>\n<\/div>\n
 <\/p>\n
\u8f6c\u5316\u547d\u4ee4\uff1a<\/p>\n
\n
qemu-img convert<\/strong> -c<\/strong> -f fmt -O<\/strong> out_fmt -o<\/strong> options fname out_fname<\/strong><\/pre>\n<\/div>\n
 <\/p>\n
-c\uff1a\u91c7\u7528\u538b\u7f29\uff0c\u53ea\u6709qcow\u548cqcow2\u624d\u652f\u6301<\/p>\n
-f\uff1a\u6e90\u955c\u50cf\u7684\u683c\u5f0f\uff0c\u5b83\u4f1a\u81ea\u52a8\u68c0\u6d4b\uff0c\u6240\u4ee5\u7701\u7565\u4e4b<\/p>\n
-O \u76ee\u6807\u955c\u50cf\u7684\u683c\u5f0f<\/p>\n
-o \u5176\u4ed6\u9009\u5148<\/p>\n
fname\uff1a\u6e90\u6587\u4ef6<\/p>\n
out_fname:\u8f6c\u5316\u540e\u7684\u6587\u4ef6<\/p>\n
\u770b\u4f8b\u5b50\uff1a<\/p>\n
\n
hzgatt@hzgatt:~\/images$<\/span> qemu-img convert<\/strong> -c -O qcow2 vm2.raw vm2.qcow2<\/pre>\n<\/div>\n
 <\/p>\n
\n
hzgatt@hzgatt:~\/images$<\/span> ll -<\/strong>s<\/strong> total 136K\r\n   <\/span>0<\/span> -rw-r--r-- 1<\/span> hzgatt hzgatt 5<\/span>.0G  6\u6708 29<\/span> 13<\/span>:55<\/span> vm1.raw\r\n136K <\/span>-rw-r--r-- 1<\/span> hzgatt hzgatt 193K  6\u6708 29<\/span> 14<\/span>:22<\/span> vm2.qcow2\r\n   <\/span>0<\/span> -rw-r--r-- 1<\/span> hzgatt hzgatt 4<\/span>.0G  6\u6708 29<\/span> 14<\/span>:11<\/span> vm2.raw<\/pre>\n<\/div>\n
\n
hzgatt@hzgatt:~\/images$<\/span> qemu-img<\/strong> info<\/span> vm2.qcow2 \r\nimage: vm2.qcow2<\/span>file<\/span> format: qcow2\r\nvirtual size: <\/span>4<\/span>.0G (4294967296<\/span> bytes)\r\ndisk size: 136K\r\ncluster_size: <\/span>65536<\/span><\/pre>\n<\/div>\n
 <\/p>\n
\n\u5982\u679c\u60f3\u770b\u8981\u8f6c\u5316\u7684\u683c\u5f0f\u652f\u6301\u7684-o\u9009\u9879\u6709\u54ea\u4e9b\uff0c\u53ef\u4ee5\u5728\u547d\u4ee4\u672b\u5c3e\u52a0\u4e0a -o \uff1f<\/p>\n
\n
<\/a><\/span><\/div>\n
hzgatt@hzgatt:~\/images$<\/a><\/span> qemu-img convert<\/strong> -c -O qcow2 vm2.raw vm2.qcow2 -o ?<\/strong> Supported options:\r\nsize             Virtual disk size\r\nbacking_file     File name of a base image\r\nbacking_fmt      Image format of the base image\r\nencryption       Encrypt the image\r\ncluster_size     qcow2 cluster size\r\npreallocation    Preallocation mode (allowed values: off, metadata)<\/span><\/pre>\n
<\/a><\/span><\/div>\n<\/div>\n
 <\/p>\n
\n\u589e\u52a0\u51cf\u5c11\u955c\u50cf\u5927\u5c0f<\/h3>\n
\n
\u6ce8\u610f\uff1a\u53ea\u6709raw\u683c\u5f0f\u7684\u955c\u50cf\u624d\u53ef\u4ee5\u6539\u53d8\u5927\u5c0f<\/p>\n
\n
hzgatt@hzgatt:~\/images$<\/span> qemu-img resize<\/strong> vm2.raw +2GB<\/strong><\/pre>\n<\/div>\n
\n
<\/a><\/span><\/div>\n
hzgatt@hzgatt:~\/images$<\/a><\/strong> ll -s\r\ntotal 136K\r\n   <\/span>0<\/span> -rw-r--r-- 1<\/span> hzgatt hzgatt 5<\/span>.0G  6\u6708 29<\/span> 13<\/span>:55<\/span> vm1.raw\r\n136K <\/span>-rw-r--r-- 1<\/span> hzgatt hzgatt 193K  6\u6708 29<\/span> 14<\/span>:22<\/span> vm2.qcow2\r\n   <\/span>0<\/span> -rw-r--r-- 1<\/span> hzgatt hzgatt 6<\/span>.0G  6\u6708 29<\/span> 14<\/span>:28<\/span> vm2.raw\r\nhzgatt@hzgatt:<\/span>~\/images$ qemu-img info<\/span> vm2.raw \r\nimage: vm2.raw<\/span>file<\/span> format: raw\r\nvirtual size: <\/span>6<\/span>.0G (6442450944<\/span> bytes)\r\ndisk size: <\/span>0<\/span><\/pre>\n
<\/a><\/span><\/div>\n<\/div>\n
 <\/p>\n
\u5feb\u7167<\/h3>\n
\n
\u67e5\u770b\u5feb\u7167<\/strong><\/p>\n
\n
qemu-img snapshot -l<\/strong> \/images\/vm2.qcow2<\/pre>\n<\/div>\n
\u6ce8\u610f\uff1a\u53ea\u6709qcow2\u624d\u652f\u6301\u5feb\u7167<\/p>\n
\u6253\u5feb\u7167<\/strong><\/p>\n
\n
qemu-img snapshot -c<\/strong> booting vm2.qcow2<\/pre>\n<\/div>\n
 <\/p>\n
\u4e3e\u4f8b\uff1a<\/p>\n
\n
hzgatt@hzgatt:~\/images$<\/span> qemu-img snapshot<\/strong> -c booting vm2.qcow2 hzgatt@hzgatt:<\/span><\/span>~\/images$<\/span> qemu-img snapshot<\/strong> -l vm2.qcow2 \r\nSnapshot list:\r\nID        TAG                 VM SIZE                DATE       VM CLOCK<\/span>1<\/span>         booting                   0<\/span> 2012<\/span>-06<\/span>-29<\/span> 14<\/span>:35<\/span>:04<\/span>   00<\/span>:00<\/span>:00.000<\/span><\/pre>\n<\/div>\n
 <\/p>\n
\u4ece\u5feb\u7167\u6062\u590d\uff1a<\/strong><\/p>\n
\n
qemu-img snapshot<\/strong> -a<\/strong> 1<\/span> \/images\/vm2.qcow2<\/pre>\n<\/div>\n
\u7136\u540e\u4ecekvm\u542f\u52a8\u8fd9\u4e2a\u865a\u62df\u673a\uff0c\u4f1a\u53d1\u73b0\u865a\u62df\u673a\u53c8\u5728\u6253\u5feb\u7167\u65f6\u7684\u72b6\u6001\u4e86<\/p>\n
 <\/p>\n
\u5220\u9664\u5feb\u7167\uff1a<\/p>\n
\n
qemu-img snapshot -d<\/strong> 2<\/span> \/images\/vm2.qcow<\/pre>\n<\/div>\n
 <\/p>\n
 <\/p>\n
\u4f7f\u7528\u6d3e\u751f\u955c\u50cf(qcow2)<\/strong><\/h3>\n
\n
    \u5f53\u521b\u5efa\u7684\u865a\u62df\u673a\u8d8a\u6765\u8d8a\u591a\uff0c\u5e76\u4e14\u4f60\u53d1\u73b0\u597d\u591a\u865a\u62df\u673a\u90fd\u662f\u540c\u4e00\u4e2a\u64cd\u4f5c\u7cfb\u7edf\uff0c\u5b83\u4eec\u7684\u533a\u522b\u5c31\u662f\u5b89\u88c5\u7684\u8f6f\u4ef6\u4e0d\u5927\u4e00\u6837\uff0c\u90a3\u4e48\u4f60\u80af\u5b9a\u4f1a\u5e0c\u671b\u628a\u4ed6\u4eec\u516c\u5171\u7684\u90e8\u5206\u63d0\u53d6\u51fa\u6765\uff0c\u53ea\u4fdd\u5b58\u90a3\u4e9b\u4e0e\u516c\u5171\u90e8\u5206\u4e0d\u540c\u7684\u4e1c\u897f\uff0c\u8fd9\u6837\u955c\u50cf\u5927\u5c0f\u4e0b\u53bb\u4e86\uff0c\u7a7a\u95f4\u53d8\u591a\u4e86\uff0c\u7ba1\u7406\u4e5f\u65b9\u4fbf\u4e86\u3002\u6d3e\u751f\u955c\u50cf\u5c31\u662f\u7528\u6765\u5e72\u8fd9\u4e8b\u7684\uff01<\/p>\n
\u9996\u5148\u770b\u4e00\u4e2a\u539f\u59cb\u955c\u50cf<\/p>\n
\n
hzgatt@hzgatt:~\/images$<\/span> qemu-img info<\/span><\/strong> vm3_base.raw \r\nimage: vm3_base.raw<\/span>file<\/span> format: raw\r\nvirtual size: <\/span>2<\/span>.0G (2147483648<\/span> bytes)\r\ndisk size: <\/span>2<\/span>.0G<\/pre>\n<\/div>\n
\u73b0\u5728\u6211\u4eec\u65b0\u5efa\u4e00\u4e2a\u955c\u50cf\uff0c\u4f46\u662f\u6d3e\u751f\u81ea\u5b83<\/p>\n
\n
hzgatt@hzgatt:~\/images$<\/span> qemu-img create<\/strong> -f qcow2 vm3_5.qcow2 -o backing_file=<\/strong>vm3_base.raw 5G<\/strong> Formatting <\/span>'<\/span>vm3_5.qcow2<\/span>'<\/span>, fmt<\/span>=qcow2 size=5368709120<\/span> backing_file='<\/span>vm3_base.raw<\/span>'<\/span> encryption=off cluster_size=65536<\/span><\/pre>\n<\/div>\n
 <\/p>\n
\n
hzgatt@hzgatt:~\/<\/span>images$<\/span> ll<\/strong><\/span>-rw-r--r-- 1<\/span> hzgatt hzgatt 193K  6\u6708 29<\/span> 15<\/span>:00<\/span> vm3_5.qcow2<\/span>-rw-r--r-- 1<\/span> hzgatt hzgatt 2<\/span>.0G  6\u6708 29<\/span> 14<\/span>:51<\/span> vm3_base.raw <\/span><\/span><\/pre>\n<\/div>\n
 <\/p>\n
\n
<\/a><\/span><\/div>\n
hzgatt@hzgatt:~\/images$<\/a><\/span> qemu-img info<\/span><\/strong> vm3_5.qcow2<\/strong> \r\nimage: vm3_5.qcow2<\/span>file<\/span> format: qcow2\r\nvirtual size: <\/span>5<\/span>.0G (5368709120<\/span> bytes)\r\ndisk size: 136K\r\ncluster_size: <\/span>65536<\/span> backing <\/span>file<\/span>: vm3_base.raw (actual path: vm3_base.raw)<\/span><\/pre>\n
<\/a><\/span><\/div>\n<\/div>\n
 <\/p>\n
 ^_^\uff0c\u8fd9\u4e2a\u955c\u50cf\u624d136K\uff0c\u591f\u7701\u4e86\u5427\u3002DRY\u6c38\u8fdc\u7684\u771f\u7406\u554a\uff01<\/p>\n
\n\u73b0\u5728\u6211\u4eec\u5728vm3_5.qcow2\u4e0a\u6253\u4e86\u5f88\u591a\u5b89\u5168\u8865\u4e01\uff0c\u7136\u540e\u53d1\u73b0\u6211\u53c8\u60f3\u5728vm3_5.qcow2\u4e0a\u6d3e\u751f\u65b0\u7684\u865a\u62df\u673a\uff0co(\u2229\u2229)o...\u54c8\u54c8\uff0c\u8fd9\u4e0b\u600e\u4e48\u529e\u5462\uff1f<\/p>\n
\n
hzgatt@hzgatt:~\/images$<\/span> qemu-img convert<\/strong> -O raw vm3_5.qcow2 vm3_base2.raw<\/pre>\n<\/div>\n
 <\/p>\n
\n
hzgatt@hzgatt:~\/images$<\/span> qemu-img info<\/span><\/strong> vm3_base2.raw \r\nimage: vm3_base2.raw<\/span>file<\/span> format: raw\r\nvirtual size: <\/span>5<\/span>.0G (5368709120<\/span> bytes)\r\ndisk size: 592M<\/span><\/pre>\n<\/div>\n
 <\/p>\n
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 <\/p>\n","protected":false},"excerpt":{"rendered":"
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