Before installing Redis Enterprise Software, make sure all required ports are available.

Database ports

Make sure that the ports Redis assigns to databases are available and are not being used by the operating system or other processes.

To avoid port collision, update /etc/sysctl.conf to include:

net.ipv4.ip_local_port_range = 30000 65535

Port 53

If port 53 is in use, the installation fails. This can occur in default installations of Ubuntu 18.04 and 20.04 in which systemd-resolved (DNS server) is running.

To prevent this issue, change the system configuration to make this port available before installation.

  1. Edit /etc/systemd/resolved.conf:

    sudo vi /etc/systemd/resolved.conf
  2. Add DNSStubListener=no as the last line in the file and save the file.

  3. Rename the current /etc/resolv.conf file:

    sudo mv /etc/resolv.conf /etc/resolv.conf.orig
  4. Create a symbolic link for /etc/resolv.conf:

    sudo ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf
  5. Restart the DNS service:

    sudo service systemd-resolved restart