package command import ( "fmt" "github.com/hashicorp/consul/command/base" "strings" ) // JoinCommand is a Command implementation that tells a running Consul // agent to join another. type JoinCommand struct { base.Command } func (c *JoinCommand) Help() string { helpText := ` Usage: consul join [options] address ... Tells a running Consul agent (with "consul agent") to join the cluster by specifying at least one existing member. ` + c.Command.Help() return strings.TrimSpace(helpText) } func (c *JoinCommand) Run(args []string) int { var wan bool f := c.Command.NewFlagSet(c) f.BoolVar(&wan, "wan", false, "Joins a server to another server in the WAN pool.") if err := c.Command.Parse(args); err != nil { return 1 } addrs := f.Args() if len(addrs) == 0 { c.UI.Error("At least one address to join must be specified.") c.UI.Error("") c.UI.Error(c.Help()) return 1 } client, err := c.Command.HTTPClient() if err != nil { c.UI.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err)) return 1 } joins := 0 for _, addr := range addrs { err := client.Agent().Join(addr, wan) if err != nil { c.UI.Error(fmt.Sprintf("Error joining address '%s': %s", addr, err)) } else { joins++ } } if joins == 0 { c.UI.Error("Failed to join any nodes.") return 1 } c.UI.Output(fmt.Sprintf( "Successfully joined cluster by contacting %d nodes.", joins)) return 0 } func (c *JoinCommand) Synopsis() string { return "Tell Consul agent to join cluster" }