   AVAILABLE   AGE
istio-citadel   1         1         1            1           1m
</code></pre><p>Citadel is up if the &ldquo;AVAILABLE&rdquo; column is 1.</p><h2 id=verify-keys-and-certificates-installation>Verify keys and certificates installation</h2><p>Istio automatically installs necessary keys and certificates for mutual TLS authentication in all sidecar containers. Run command below to confirm key and certificate files exist under <code>/etc/certs</code>:</p><pre><code class=language-bash data-expan