Red Hat Summit Red Hat SummitSupportoConsoleSviluppatoriInizia una provaContatti

Questo contenuto non è disponibile nella lingua selezionata.

Chapter 39. Adding etcd nodes after restoring

After the first instance is running, you can add multiple etcd servers to your cluster.

Procedure

  1. Get the etcd name for the instance in the ETCD_NAME variable: 

    # grep ETCD_NAME /etc/etcd/etcd.conf
    Copy to Clipboard Toggle word wrap

  2. Get the IP address where etcd listens for peer communication: 

    # grep ETCD_INITIAL_ADVERTISE_PEER_URLS /etc/etcd/etcd.conf
    Copy to Clipboard Toggle word wrap

  3. If the node was previously part of a etcd cluster, delete the previous etcd data: 

    # rm -Rf /var/lib/etcd/*
    Copy to Clipboard Toggle word wrap

  4. On the etcd host where etcd is properly running, add the new member:

    • If you use the v2 etcd api, run this command: 

      $ etcdctl2 member add <name> <advertise_peer_urls>
      Copy to Clipboard Toggle word wrap

    • If you use the v3 etcd api, run this command: 

      # etcdctl3 member add *<name>* \
  --peer-urls="*<advertise_peer_urls>*"
      Copy to Clipboard Toggle word wrap

    The command outputs some variables. For example: 

    ETCD_NAME="master2"
ETCD_INITIAL_CLUSTER="master-0.example.com=https://192.168.55.8:2380"
ETCD_INITIAL_CLUSTER_STATE="existing"
    Copy to Clipboard Toggle word wrap

  5. Add the values from the previous command to the /etc/etcd/etcd.conf file of the new host: 

    # vi /etc/etc/etcd.conf
    Copy to Clipboard Toggle word wrap

  6. Start the etcd service in the node joining the cluster: 

    # systemctl start etcd.service
    Copy to Clipboard Toggle word wrap

  7. Check for error messages: 

    $ journalctl -fu etcd.service
    Copy to Clipboard Toggle word wrap
  8. Repeat the previous steps for every etcd node to be added.

  9. Once you add all the nodes, verify the cluster status and cluster health:

    • If you use the v2 etcd api, run the following commands: 

      # etcdctl2 member list
5cd050b4d701: name=master1 peerURLs=https://10.0.0.7:2380 clientURLs=https://10.0.0.7:2379 isLeader=true
d0c57659d8990cbd: name=master2 peerURLs=https://10.0.0.5:2380 clientURLs=https://10.0.0.5:2379 isLeader=false
e4696d637de3eb2d: name=master3 peerURLs=https://10.0.0.6:2380 clientURLs=https://10.0.0.6:2379 isLeader=false
      Copy to Clipboard Toggle word wrap 
      # etcdctl2 cluster-health
member 5cd050b4d701 is healthy: got healthy result from https://10.0.0.7:2379
member d0c57659d8990cbd is healthy: got healthy result from https://10.0.0.5:2379
member e4696d637de3eb2d is healthy: got healthy result from https://10.0.0.6:2379
cluster is healthy
      Copy to Clipboard Toggle word wrap

    • If you use the v3 etcd api, run the following commands: 

      # etcdctl3 endpoint health
https://master-0.example.com:2379 is healthy: successfully committed proposal: took = 1.423459ms
https://master-1.example.com:2379 is healthy: successfully committed proposal: took = 1.767481ms
https://master-2.example.com:2379 is healthy: successfully committed proposal: took = 1.599694ms

# etcdctl3 endpoint status
https://master-0.example.com:2379, 40bef1f6c79b3163, 3.2.5, 28 MB, true, 9, 2878
https://master-1.example.com:2379, 1ea57201a3ff620a, 3.2.5, 28 MB, false, 9, 2878
https://master-2.example.com:2379, 59229711e4bc65c8, 3.2.5, 28 MB, false, 9, 2878
      Copy to Clipboard Toggle word wrap
Torna in cima
Red Hat logoGithubredditYoutubeTwitter

Formazione

Prova, acquista e vendi

Community

Informazioni sulla documentazione di Red Hat

Aiutiamo gli utenti Red Hat a innovarsi e raggiungere i propri obiettivi con i nostri prodotti e servizi grazie a contenuti di cui possono fidarsi. Esplora i nostri ultimi aggiornamenti.

Rendiamo l’open source più inclusivo

Red Hat si impegna a sostituire il linguaggio problematico nel codice, nella documentazione e nelle proprietà web. Per maggiori dettagli, visita il Blog di Red Hat.

Informazioni su Red Hat

Forniamo soluzioni consolidate che rendono più semplice per le aziende lavorare su piattaforme e ambienti diversi, dal datacenter centrale all'edge della rete.

Theme

© 2025 Red Hat