1SHEEPDOG(8) System Manager's Manual SHEEPDOG(8)
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6 sheep - Distributed Block Storage System for QEMU
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9 sheep [options] [PATH]
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12 sheep - Sheepdog is a distributed storage system for QEMU. It provides
13 highly available block level storage volumes to virtual machines.
14 Sheepdog supports advanced volume management features such as snapshot,
15 cloning, and thin provisioning. The architecture of Sheepdog is fully
16 symmetric; there is no central node such as a meta-data server.
17 The server daemon is called sheep(8). A command line utility is avail‐
19 able via dog(8). QEMU virtual machines use the sheep daemon via a
20 block driver available in qemu(1).
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23 -b, --bindaddr
24 specify IP address of interface to listen on
25 Example:
27 $ sheep -b 192.168.1.1 ...
29 This tries to teach sheep listen to NIC of 192.168.1.1.
31 Example:
33 $ sheep -b 0.0.0.0 ...
35 This tries to teach sheep listen to all the NICs available. It
37 can be useful when you want sheep to response dog without speci‐
38 fied address and port.
39 -c, --cluster
41 specify the cluster driver (default: corosync)
42 Available arguments:
44 local: use local driver
45 corosync: use corosync driver
46 zookeeper: use zookeeper driver, need extra arguments
47 zookeeper arguments: connection-string,timeout=value (default
49 as 3000)
50 Example:
52 $ sheep -c zookeeper:IP1:PORT1,IP2:PORT2,IP3:PORT3[/clus‐
54 ter_id][,timeout=1000] ...
55 This tries to use 3 node zookeeper cluster, which can be reached
57 by IP1:PORT1, IP2:PORT2, IP3:PORT3 to manage membership and
58 broadcast message and set the timeout of node heartbeat as 1000
59 milliseconds. cluster_id is used to identify which cluster it
60 belongs to, if not set, /sheepdog is used internally as default.
61 -D, --directio
63 use direct IO for backend store
64 -f, --foreground
67 make the program run in foreground
68 -g, --gateway
71 make the program run as a gateway mode
72 -h, --help
75 display this help and exit
76 -i, --ioaddr
78 use separate network card to handle IO requests (default: dis‐
79 abled)
80 Example:
82 $ sheep -i host=192.168.1.1,port=7002 ...
84 This tries to add a dedicated IO NIC of 192.168.1.1:7002 to
86 transfer data. If IO NIC is down, sheep will fallback to non IO
87 NIC to transfer data.
88 -j, --journal
90 use journal file to log all the write operations. (default: dis‐
91 abled)
92 Available arguments:
94 size=: size of the journal in megabyes
95 dir=: path to the location of the journal (default: $STORE)
96 skip: if specified, skip the recovery at startup
97 Example:
99 $ sheep -j dir=/journal,size=1G
101 This tries to use /journal as the journal storage of the size 1G
103 -l, --log
105 specify the log level, the log directory and the log format(log
106 level default: 6 [SDOG_INFO])
107 Example:
109 $ sheep -l dir=/var/log/,level=debug,format=server ...
111 Available arguments:
113 dir=: path to the location of sheep.log
114 level=: log level of sheep.log
115 format=: log format type
116 dst=: log destination type
117 if dir is not specified, use metastore directory
119 Available log levels:
121 Level Description
122 emerg system has failed and is unusable
123 alert action must be taken immediately
124 crit critical conditions
125 err error conditions
126 warning warning conditions
127 notice normal but significant conditions
128 info informational notices
129 debug debugging messages default log level is info
130 Available log format:
132 FormatType Description
133 default raw format
134 server raw format with timestamp
135 json json format
136 Available log destination:
138 DestinationType Description
139 default dedicated file in a directory used by sheep
140 syslog syslog of the system
141 stdout standard output
142 -n, --nosync
144 drop O_SYNC for write of backend
145 -p, --port
148 specify the TCP port on which to listen (default: 7000)
149 -P, --pidfile
152 create a pid file
153 -R, --recovery
156 specify the recovery speed throttling
157 Available arguments:
159 max=: object recovery process maximum count of each interval
160 interval=: object recovery interval time (millisec) Example:
161 $ sheep -R max=50,interval=1000 ...
163 -u, --upgrade
166 upgrade to the latest data layout
167 -v, --version
170 show the version
171 Sheepdog daemon version 1.0.1
173 -V, --vnodes
175 set number of vnodes
176 Example:
178 $ sheep -V 128
180 set number of vnodes
182 -w, --wq-threads
184 specify a number of threads for workqueue
185 -W, --wildcard-recovery
188 wildcard recovery for first time
189 -y, --myaddr
192 specify the address advertised to other sheep
193 Example:
195 $ sheep -y 192.168.1.1 ...
197 This tries to tell other nodes through what address they can
199 talk to this sheep.
200 -z, --zone
202 specify the zone id (default: determined by listen address)
203 Example:
205 $ sheep -z 1 ...
207 This tries to set the zone ID of this sheep to 1 and sheepdog
209 won't store more than one copy of any object into this same zone
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213 Proper LSB systems will store sheepdog files in /var/lib/sheepdog. The
214 init script uses this directory by default. The directory must be on a
215 filesystem with xattr support. In the case of ext3, user_xattr should
216 be added to the mount options.
217 mount -o remount,user_xattr /var/lib/sheepdog
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222 sheepdog requires QEMU 0.13.z or later and Corosync 1.y.z.
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226 /var/lib/sheepdog - Directory containing block storage information
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230 dog(8), qemu(1), sheepfs(8), corosync_overview(8)
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234 This software is developed by the sheepdog community which may be
235 reached via mailing list at <sheepdog@lists.wpkg.org>.
236 2021-07-23 SHEEPDOG(8)