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45 | Secured Communication with Zookeeper |
Optional secured communication between ClickHouse and Zookeeper
You should specify ssl.keyStore.location
, ssl.keyStore.password
and ssl.trustStore.location
, ssl.trustStore.password
for communication with ClickHouse client over SSL. These options are available from Zookeeper version 3.5.2.
You can add zookeeper.crt
to trusted certificates.
sudo cp zookeeper.crt /usr/local/share/ca-certificates/zookeeper.crt
sudo update-ca-certificates
Client section in config.xml
will look like:
<client>
<certificateFile>/etc/clickhouse-server/client.crt</certificateFile>
<privateKeyFile>/etc/clickhouse-server/client.key</privateKeyFile>
<loadDefaultCAFile>true</loadDefaultCAFile>
<cacheSessions>true</cacheSessions>
<disableProtocols>sslv2,sslv3</disableProtocols>
<preferServerCiphers>true</preferServerCiphers>
<invalidCertificateHandler>
<name>RejectCertificateHandler</name>
</invalidCertificateHandler>
</client>
Add Zookeeper to ClickHouse config with some cluster and macros:
<clickhouse>
<zookeeper>
<node>
<host>localhost</host>
<port>2281</port>
<secure>1</secure>
</node>
</zookeeper>
</clickhouse>
Start clickhouse-server
. In logs you should see:
<Trace> ZooKeeper: initialized, hosts: secure://localhost:2281
Prefix secure://
indicates that connection is secured by SSL.
To ensure traffic is encrypted run tcpdump
on secured port:
tcpdump -i any dst port 2281 -nnXS
And query in clickhouse-client
:
SELECT * FROM system.zookeeper WHERE path = '/';
On unencrypted connection you will see in tcpdump
output something like this:
..../zookeeper/quota.
On encrypted connection you should not see this.