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startup: do not start minio server if port is not free. Fixes #1207

This commit is contained in:
Krishna Srinivas 2016-03-09 19:39:40 +05:30
parent 91800cff53
commit ea7ea427ca
1 changed files with 47 additions and 1 deletions
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48
server-main.go
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@ -251,8 +251,54 @@ func checkServerSyntax(c *cli.Context) {
}
}
// extract port number from address.
// address should be of the form host:port
func getPort(address string) int {
_, portStr, e := net.SplitHostPort(address)
fatalIf(probe.NewError(e), "Unable to split host port.", nil)
portInt, e := strconv.Atoi(portStr)
fatalIf(probe.NewError(e), "Invalid port number.", nil)
return portInt
}
// Make sure that none of the other processes are listening on the
// specified port on any of the interfaces.
//
// On linux if a process is listening on 127.0.0.1:9000 then Listen()
// on ":9000" fails with the error "port already in use".
// However on Mac OSX Listen() on ":9000" falls back to the IPv6 address.
// This causes confusion on Mac OSX that minio server is not reachable
// on 127.0.0.1 even though minio server is running. So before we start
// the minio server we make sure that the port is free on all the IPs.
func checkPortAvailability(port int) {
ifcs, e := net.Interfaces()
if e != nil {
fatalIf(probe.NewError(e), "Unable to list interfaces.", nil)
}
for _, ifc := range ifcs {
addrs, e := ifc.Addrs()
if e != nil {
fatalIf(probe.NewError(e), fmt.Sprintf("Unable to list addresses on interface %s.", ifc.Name), nil)
}
for _, addr := range addrs {
ip := addr.(*net.IPNet).IP
tcpAddr := net.TCPAddr{IP: ip, Port: port, Zone: ifc.Name}
l, e := net.ListenTCP("tcp", &tcpAddr)
if e != nil {
fatalIf(probe.NewError(e), fmt.Sprintf("Unable to listen on IP %s, port %.d", tcpAddr.IP, tcpAddr.Port), nil)
}
e = l.Close()
if e != nil {
fatalIf(probe.NewError(e), fmt.Sprintf("Unable to close listener on IP %s, port %.d", tcpAddr.IP, tcpAddr.Port), nil)
}
}
}
}
func serverMain(c *cli.Context) {
checkServerSyntax(c)
address := c.GlobalString("address")
checkPortAvailability(getPort(address))
conf, err := initServer()
fatalIf(err.Trace(), "Failed to read config for minio.", nil)
@ -294,7 +340,7 @@ func serverMain(c *cli.Context) {
}
tls := (certFile != "" && keyFile != "")
serverConfig := cloudServerConfig{
Address: c.GlobalString("address"),
Address: address,
AccessLog: c.GlobalBool("enable-accesslog"),
AccessKeyID: conf.Credentials.AccessKeyID,
SecretAccessKey: conf.Credentials.SecretAccessKey,