// retryJoinWan is used to handle retrying a join -wan until it succeeds or all
// retries are exhausted.
func (c *Command) retryJoinWan(config *Config, errCh chan<- struct{}) {
if len(config.RetryJoinWan) == 0 {
return
}
logger := c.agent.logger
logger.Printf("[INFO] agent: Joining WAN cluster...")
attempt := 0
for {
n, err := c.agent.JoinWAN(config.RetryJoinWan)
if err == nil {
logger.Printf("[INFO] agent: Join -wan completed. Synced with %d initial agents", n)
return
}
attempt++
if config.RetryMaxAttemptsWan > 0 && attempt > config.RetryMaxAttemptsWan {
logger.Printf("[ERROR] agent: max join -wan retry exhausted, exiting")
close(errCh)
return
}
logger.Printf("[WARN] agent: Join -wan failed: %v, retrying in %v", err,
config.RetryIntervalWan)
time.Sleep(config.RetryIntervalWan)
}
}
// retryJoin is used to handle retrying a join until it succeeds or all
// retries are exhausted.
func (c *Command) retryJoin(config *Config, errCh chan<- struct{}) {
ec2Enabled := config.RetryJoinEC2.TagKey != "" && config.RetryJoinEC2.TagValue != ""
if len(config.RetryJoin) == 0 && !ec2Enabled && config.RetryJoinGCE.TagValue == "" {
return
}
logger := c.agent.logger
logger.Printf("[INFO] agent: Joining cluster...")
attempt := 0
for {
var servers []string
var err error
switch {
case ec2Enabled:
servers, err = config.discoverEc2Hosts(logger)
if err != nil {
logger.Printf("[ERROR] agent: Unable to query EC2 instances: %s", err)
}
logger.Printf("[INFO] agent: Discovered %d servers from EC2", len(servers))
case config.RetryJoinGCE.TagValue != "":
servers, err = config.discoverGCEHosts(logger)
if err != nil {
logger.Printf("[ERROR] agent: Unable to query GCE insances: %s", err)
}
logger.Printf("[INFO] agent: Discovered %d servers from GCE", len(servers))
}
servers = append(servers, config.RetryJoin...)
if len(servers) == 0 {
err = fmt.Errorf("No servers to join")
} else {
n, err := c.agent.JoinLAN(servers)
if err == nil {
logger.Printf("[INFO] agent: Join completed. Synced with %d initial agents", n)
return
}
}
attempt++
if config.RetryMaxAttempts > 0 && attempt > config.RetryMaxAttempts {
logger.Printf("[ERROR] agent: max join retry exhausted, exiting")
close(errCh)
return
}
logger.Printf("[WARN] agent: Join failed: %v, retrying in %v", err,
config.RetryInterval)
time.Sleep(config.RetryInterval)
}
}