open-consul/command/join/join.go

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package join
import (
"flag"
"fmt"
"github.com/hashicorp/consul/command/flags"
"github.com/mitchellh/cli"
)
func New(ui cli.Ui) *cmd {
c := &cmd{UI: ui}
c.init()
return c
}
type cmd struct {
UI cli.Ui
flags *flag.FlagSet
http *flags.HTTPFlags
help string
wan bool
}
func (c *cmd) init() {
c.flags = flag.NewFlagSet("", flag.ContinueOnError)
c.flags.BoolVar(&c.wan, "wan", false,
"Joins a server to another server in the WAN pool.")
c.http = &flags.HTTPFlags{}
flags.Merge(c.flags, c.http.ClientFlags())
c.help = flags.Usage(help, c.flags)
}
func (c *cmd) Run(args []string) int {
if err := c.flags.Parse(args); err != nil {
return 1
}
addrs := c.flags.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.http.APIClient()
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, c.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 *cmd) Synopsis() string {
return synopsis
}
func (c *cmd) Help() string {
return c.help
}
const synopsis = "Tell Consul agent to join cluster"
const help = `
Usage: consul join [options] address ...
Tells a running Consul agent (with "consul agent") to join the cluster
by specifying at least one existing member.
`