xen-drbd

annotate xen-drbd.py @ 23:6e01df357a6a

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automatic hostname in topology
author igor
date Tue Feb 19 12:53:45 2008 +0200 (2008-02-19)
parents 1c7442c793a1
children ccf4137ea2a6
rev   line source
igor@0 1 #!/usr/bin/python
igor@0 2
igor@23 3 network='od'
igor@0 4
igor@2 5 import sys,os,imp
igor@0 6 from commands import mkarg
igor@0 7
eb@1 8
igor@0 9 sys.path.append('/etc/xen')
igor@0 10 try:
igor@0 11 exec 'from %s import *' % (network)
igor@23 12 except ImportError:
igor@0 13 print "Can't find or interpret module %s with topology description" %(network)
igor@0 14 sys.exit(1)
igor@0 15
eb@5 16 xen_drbd_start="/etc/xen/xen-drbd-start"
igor@2 17 domain_create_line="xm create "+xen_drbd_start+" network="+network+" domain=%s"
igor@0 18
igor@0 19 def the_peer_of(node):
igor@2 20 if node == node1:
igor@2 21 another_node=node2
igor@2 22 else:
igor@2 23 another_node=node1
igor@2 24 return another_node
igor@0 25
igor@0 26 he_is=the_peer_of(i_am)
igor@0 27
igor@0 28 def log_error(error):
igor@2 29 print error
igor@0 30
igor@0 31 def run_now(command,node=i_am):
igor@2 32 if node == i_am:
igor@2 33 line=command+" > /dev/stderr"
igor@2 34 else:
igor@2 35 line="ssh %s %s < /dev/null > /dev/stderr" % (node,mkarg(command))
igor@2 36 (p, child_stdout, child_stderr) = os.popen3(line)
igor@2 37 output = child_stderr.read()
igor@2 38 #p = os.popen(line)
igor@2 39 #output = p.read()
igor@2 40 p.close()
igor@2 41 return output
igor@0 42
igor@0 43 def run(command,node=i_am):
igor@2 44 run_now(command,node)
igor@2 45 # if node == i_am:
igor@2 46 # print command
igor@2 47 # else:
igor@2 48 # print "ssh %s %s < /dev/null > /dev/stderr" % (node,mkarg(command))
igor@0 49
igor@0 50
igor@0 51 def get_drbd_resources(domain):
igor@2 52 disk=[]
igor@2 53 for disk_description in disk_table[domain]:
igor@2 54 if disk_description.find(":") == -1:
igor@2 55 disk.append(domain)
igor@2 56 else:
igor@2 57 disk.append((disk_description.split(':'))[0])
igor@2 58 return disk
igor@2 59
igor@0 60
igor@0 61 def set_drbd_primary(domain, node=i_am):
igor@2 62 drbd_resources=get_drbd_resources(domain)
igor@2 63 for drbd in drbd_resources:
igor@2 64 run("drbdadm primary %s"%(drbd),node)
igor@0 65
igor@0 66 def set_drbd_secondary(domain, node=i_am):
igor@2 67 drbd_resources=get_drbd_resources(domain)
igor@2 68 for drbd in drbd_resources:
igor@2 69 run("drbdadm secondary %s"%(drbd),node)
igor@0 70
igor@0 71 def get_domain_id(domain,node=i_am):
igor@2 72 """
igor@2 73 Returns domain id of the <domain> or -1 if the <domain> is not running on the <node>
igor@2 74 """
igor@2 75 res=run_now("xm list | awk '{if ($1 == \"'%s'\") print $2}'" % domain, node).rstrip("\n")
igor@2 76 if not res:
igor@2 77 res = -1
igor@2 78 else:
igor@2 79 res = int(res)
igor@2 80 return res
igor@0 81
igor@0 82 def get_drbd_id(resource,node=i_am):
igor@2 83 res=run_now("ls -l /dev/drbd/%s 2> /dev/null | awk '{print $10}' | sed s@/dev/drbd@@" %resource, node).rstrip("\n")
igor@2 84 if not res:
igor@2 85 res = -1
igor@2 86 else:
igor@2 87 res = int(res)
igor@2 88 return res
igor@0 89
igor@0 90 def get_drbd_state(resource,node=i_am):
igor@2 91 res=run_now("drbdadm state %s | sed s@/.*@@" %resource, node).rstrip("\n")
igor@2 92 if not res:
igor@2 93 res = -1
igor@2 94 return res
igor@0 95
igor@0 96 def get_drbd_cstate(resource,node=i_am):
igor@2 97 res=run_now("drbdadm cstate %s " %resource, node).rstrip("\n")
igor@2 98 if not res:
igor@2 99 res = -1
igor@2 100 return res
igor@0 101
igor@0 102 def start_domain(domain,node=i_am):
igor@2 103 if (get_domain_id(domain,i_am) != -1):
igor@2 104 log_error("Domain %s is running already on the node %s" % (domain,i_am))
igor@2 105 return -1
igor@2 106 if (get_domain_id(domain,he_is) != -1):
igor@2 107 log_error("Domain %s is running already on the node %s" % (domain,he_is))
igor@2 108 return -1
igor@2 109 another_node=the_peer_of(node)
igor@2 110 set_drbd_secondary(domain,another_node)
igor@2 111 set_drbd_primary(domain,node)
igor@2 112 run(domain_create_line % domain)
igor@0 113
igor@0 114 def migrate_domain_out(domain,node=i_am):
igor@2 115 if (get_domain_id(domain,node) == -1):
igor@2 116 log_error("Domain %s is not running on the node %s" % (domain,node))
igor@2 117 return -1
igor@2 118 another_node=the_peer_of(node)
igor@2 119 print "Migrating the domain <%s> from the node <%s> to the node <%s>" % (domain, node, another_node)
igor@2 120 set_drbd_primary(domain,another_node)
igor@2 121 run("xm migrate %s %s --live" % (domain,another_node),node)
igor@2 122 run("sleep 2")
igor@2 123 set_drbd_secondary(domain,node)
igor@2 124 print "+ Done"
igor@2 125
igor@0 126 def migrate_domain_in(domain,node=i_am):
igor@2 127 migrate_domain_out(domain,the_peer_of(node))
igor@0 128
igor@0 129 def migrate_domain(domain,node):
igor@2 130 migrate_domain_in(domain,node)
igor@0 131
igor@0 132 def running_domains(node=i_am):
igor@2 133 xm_domains=run_now("xm list | awk '{print $1}'", node).split("\n")
igor@2 134 return filter(lambda x: x in xm_domains, domains)
igor@0 135
igor@0 136 def migrate_all_out(node=i_am):
igor@2 137 for domain in running_domains(node):
igor@2 138 migrate_domain_out(domain,node)
igor@0 139
igor@0 140 def migrate_all_in(node=i_am):
igor@2 141 for domain in running_domains(the_peer_of(node)):
igor@2 142 migrate_domain_in(domain,node)
igor@0 143
igor@0 144 def start_all(node=i_am):
igor@2 145 for domain in domains:
igor@2 146 if not domain in running_domains(node) and not domain in running_domains(the_peer_of(node)):
igor@2 147 start_domain(domain,node)
igor@0 148
igor@0 149 def start_my_domains(node=i_am):
igor@2 150 for domain in domain_home[node]:
igor@2 151 if not domain in running_domains(node) and not domain in running_domains(the_peer_of(node)):
igor@2 152 start_domain(domain,node)
igor@0 153
igor@0 154 def migrate_my_domains_home(node=i_am):
igor@2 155 for domain in domain_home[node]:
igor@2 156 if not domain in running_domains(node) and domain in running_domains(the_peer_of(node)):
igor@2 157 migrate_domain_in(domain,node)
igor@2 158
igor@0 159 def migrate_and_start_all(node=i_am):
igor@2 160 migrate_my_domains_home(node)
igor@2 161 start_my_domains(node)
igor@2 162
igor@2 163 def do_import(name, source):
igor@2 164 module = imp.new_module(name)
igor@2 165 sys.modules[name] = module
igor@2 166 exec source in vars(module)
igor@2 167 return module
igor@2 168
igor@2 169 def load_file(file):
igor@2 170 f=open(file)
igor@2 171 result=f.read()
igor@2 172 return result
igor@2 173
igor@2 174 def dump_config(domain):
igor@2 175 xen_domain=load_file(xen_drbd_start)
igor@2 176 xen_domain="domain=\"%s\"\n" % (domain) + xen_domain
igor@2 177 xen_domain="network=\"%s\"\n" % (network) + xen_domain
igor@2 178 do_import('xen_domain_module',xen_domain)
igor@2 179 import xen_domain_module
igor@2 180 xen_domain_module.print_config()
igor@0 181
igor@0 182 def show_usage():
igor@2 183 print """
igor@0 184 Usage:
igor@2 185 xen-drbd command [domain]
igor@0 186
igor@0 187 Commands:
igor@2 188 start domain
igor@2 189 start-all
igor@2 190 start-my-domains
igor@0 191
igor@2 192 migrate-out domain
igor@2 193 migrate-in domain
igor@2 194 migrate-all-out
igor@2 195 migrate-all-in
igor@2 196 migrate-my-domains-home
igor@2 197 migrate-and-start-all
igor@0 198
igor@2 199 dump-config domain
igor@2 200 """
igor@0 201
igor@0 202 def test():
igor@2 203 print "get_drbd_resources(samba)=",get_drbd_resources("samba")
igor@2 204 print "get_domain_id(Domain-0)=",get_domain_id("Domain-0")
igor@2 205 print "get_domain_id(samba)=",get_domain_id("samba")
igor@2 206 print "get_drbd_id(samba)=",get_drbd_id("samba")
igor@2 207 print "get_drbd_id(samba, he_is)=",get_drbd_id("samba",he_is)
igor@2 208 print "get_drbd_id(unknown_resource, he_is)=",get_drbd_id("unknown_resource",he_is)
igor@2 209 print "get_drbd_state(samba, he_is)=",get_drbd_state("samba")
igor@2 210 print "get_drbd_state(samba, he_is)=",get_drbd_state("samba",he_is)
igor@2 211 print "get_drbd_cstate(samba)=",get_drbd_cstate("samba")
igor@2 212 print "get_drbd_cstate(samba, he_is)=",get_drbd_cstate("samba",he_is)
igor@2 213 print "start_domain(samba)"
igor@2 214 start_domain("samba")
igor@2 215 print "migrate_domain_out(samba)"
igor@2 216 migrate_domain_in("samba")
igor@0 217
igor@0 218
igor@0 219 #print "get_domain_id(samba,node2)=",get_domain_id("samba",node2)
igor@0 220 #sys.exit(0)
igor@0 221
igor@0 222 if len(sys.argv) == 1:
igor@2 223 show_usage()
igor@2 224 sys.exit(0)
igor@0 225
igor@0 226 command=sys.argv[1]
igor@0 227 if len(sys.argv) == 3:
igor@2 228 domain=sys.argv[2]
igor@2 229 if command == 'start':
igor@2 230 start_domain(domain)
igor@2 231 elif command == 'migrate-out':
igor@2 232 migrate_domain_out(domain)
igor@2 233 elif command == 'migrate-in':
igor@2 234 migrate_domain_in(domain)
igor@2 235 elif command == 'dump-config':
igor@2 236 dump_config(domain)
igor@2 237 else:
igor@2 238 show_usage()
igor@2 239 sys.exit(0)
igor@0 240 elif len(sys.argv) == 2:
igor@2 241 if command == 'start-all':
igor@2 242 start_all()
igor@2 243 elif command == 'start-my-domains':
igor@2 244 start_my_domains()
igor@2 245 elif command == 'migrate-all-out':
igor@2 246 migrate_all_out()
igor@2 247 elif command == 'migrate-all-in':
igor@2 248 migrate_all_in()
igor@2 249 elif command == 'migrate-my-domains-home':
igor@2 250 migrate_my_domains_home()
igor@2 251 elif command == 'migrate-and-start-all':
igor@2 252 migrate_and_start_all()
igor@2 253 elif command == 'list':
igor@2 254 print running_domains()
igor@2 255 else:
igor@2 256 show_usage()
igor@2 257 sys.exit(0)
igor@0 258
igor@0 259
igor@0 260
igor@0 261