diff --git a/misc/ubuntu20.04deploy/custom-installation/post.sh b/misc/ubuntu20.04deploy/custom-installation/post.sh
index 450efdc7..b10cd416 100755
--- a/misc/ubuntu20.04deploy/custom-installation/post.sh
+++ b/misc/ubuntu20.04deploy/custom-installation/post.sh
@@ -1,6 +1,10 @@
 cp -a /root/.ssh /target/root/
 mkdir -p /target/etc/confluent/ssh/sshd_config.d/
 cp /custom-installation/confluent/* /target/etc/confluent/
+for i in /custom-installation/ssh/*.ca; do
+    echo '@cert-authority *' $(cat $i) >> /target/etc/ssh/ssh_known_hosts
+done
+
 cp -a /etc/ssh/ssh_host* /target/etc/confluent/ssh/
 cp -a /etc/ssh/sshd_config.d/confluent.conf /target/etc/confluent/ssh/sshd_config.d/
 cp /custom-installation/firstboot.sh /target/etc/confluent/firstboot.sh