System Requirements


Hardware and software requirements for DC/OS Enterprise

Hardware Prerequisites

You must have a single bootstrap node, an odd number of master nodes, and one or more agent nodes.

Bootstrap node

1 node with 2 Cores, 16 GB RAM, 60 GB HDD. This is the node where DC/OS installation is run. This bootstrap node must also have:

  • A high-availability (HA) TCP/Layer 3 load balancer, such as HAProxy, to balance the following TCP ports to all master nodes: 80, 443.
  • An unencrypted SSH key that can be used to authenticate with the cluster nodes over SSH. Encrypted SSH keys are not supported.

Cluster nodes

The cluster nodes are designated masters and agents during installation.

Master nodes

Here are the master node hardware requirements.

| | Minimum | Recommended | |\

-------|-----------|-------------| | Nodes | 1 | 3 or 5 | | OS |RHEL/CentOS 7.4 |RHEL/CentOS 7.4 | | Processor | 4 cores | 4 cores | | Memory | 32 GB RAM | 32 GB RAM | | Hard disk | 120 GB | 120 GB |

There are many mixed workloads on the masters, for example Mesos replicated log and ZooKeeper. Some of these require fsync()ing every so often, and this can generate a lot of very expensive random I/O.

We recommend the following:

  • Solid-state drive (SSD)
  • RAID controllers with a BBU
  • RAID controller cache configured in writeback mode

Agent nodes

Here are the agent node hardware requirements.

Minimum Recommended
Nodes 1 6 or more
OS RHEL/CentOS 7.4 RHEL/CentOS 7.4
Processor 2 cores 2 cores
Memory 16 GB RAM 16 GB RAM
Hard disk 60 GB 60 GB

The agent nodes must also have:

  • A /var directory with 10 GB or more of free space. This directory is used by the sandbox for both Docker and DC/OS Universal container runtime.
  • The agent’s work directory, /var/lib/mesos/slave, should be on a separate device. This protects all the other services from a task overflowing the disk.
  • On RHEL 7 and CentOS 7, firewalld must be stopped and disabled. It is a known Docker issue that firewalld interacts poorly with Docker. For more information, see the Docker CentOS firewalld documentation.

    sudo systemctl stop firewalld && sudo systemctl disable firewalld
  • DC/OS is installed to /opt/mesosphere. /opt/mesosphere must be on the same mountpoint as /. This is required because DC/OS installs systemd unit files under /opt/mesosphere. All systemd units must be available for enumeration during the initializing of the initial ramdisk at boot. If /opt is on a different partition or volume, systemd will fail to discover these units during the initialization of the ramdisk and DC/OS will not automatically restart upon reboot.

  • The Mesos master and agent persistent information of the cluster is stored in the var/lib/mesos directory.

    Important: Do not remotely mount /var/lib/mesos or the Docker storage directory (by default /var/lib/docker).

  • Do not mount /tmp with noexec. This will prevent Exhibitor and ZooKeeper from running.

Port and Protocol Configuration

  • Secure Shell (SSH) must be enabled on all nodes.
  • Internet Control Message Protocol (ICMP) must be enabled on all nodes.
  • All hostnames (FQDN and short hostnames) must be resolvable in DNS; both forward and reverse lookups must succeed.
  • Each node is network accessible from the bootstrap node.
  • Each node has unfettered IP-to-IP connectivity from itself to all nodes in the DC/OS cluster.
  • All ports should be open for communication from the master nodes to the agent nodes and vice versa.
  • UDP must be open for ingress to port 53 on the masters. To attach to a cluster, the Mesos agent node service (dcos-mesos-slave) uses this port to find leader.mesos.

High Speed Internet Access

High speed internet access is recommended for DC/OS installation. A minimum 10 MBit per second is required for DC/OS services. The installation of some DC/OS services will fail if the artifact download time exceeds the value of MESOS_EXECUTOR_REGISTRATION_TIMEOUT within the file /opt/mesosphere/etc/mesos-slave-common. The default value for MESOS_EXECUTOR_REGISTRATION_TIMEOUT is 10 minutes.

Software Prerequisites

Tip: Refer to this shell script for an example of how to install the software requirements for DC/OS masters and agents on a CentOS 7 host.

All Nodes


Docker must be installed on all bootstrap and cluster nodes.

Important: Docker version 1.12.x is not supported. Only versions 1.7.x - 1.11.x are supported.


  • Do not use Docker devicemapper storage driver in loop-lvm mode. For more information, see Docker and the Device Mapper storage driver.

  • Prefer OverlayFS or devicemapper in direct-lvm mode when choosing a production storage driver. For more information, see Docker’s Select a Storage Driver.

  • Manage Docker on CentOS with systemd. systemd handles starting Docker on boot and restarting it when it crashes.

  • Run Docker commands as the root user (with sudo) or as a user in the docker user group.

  • Virtual networks require Docker 1.11.

Distribution-Specific Installation

Each Linux distribution requires Docker to be installed in a specific way:

For more more information, see Docker’s distribution-specific installation instructions.

Disable sudo password prompts

To use the GUI or CLI installation methods, you must disable password prompts for sudo.

Add the following line to your /etc/sudoers file. This disables the sudo password prompt.


Alternatively, you can SSH as the root user.

Enable NTP

Network Time Protocol (NTP) must be enabled on all nodes for clock synchronization. By default, during DC/OS startup you will receive an error if this is not enabled. You can check if NTP is enabled by running one of these commands, depending on your OS and configuration:

adjtimex -p

Bootstrap node

Before installing DC/OS, you must ensure that your bootstrap node has the following prerequisites.


  • If you specify exhibitor_storage_backend: zookeeper, the bootstrap node is a permanent part of your cluster. With exhibitor_storage_backend: zookeeper the leader state and leader election of your Mesos masters is maintained in Exhibitor ZooKeeper on the bootstrap node. For more information, see the configuration parameter documentation.
  • The bootstrap node must be separate from your cluster nodes.

DC/OS setup file

Download and save the DC/OS setup file to your bootstrap node. This file is used to create your customized DC/OS build file. Contact your sales representative or for access to this file.

Docker Nginx (advanced installer)

For advanced install only, install the Docker Nginx image with this command:

sudo docker pull nginx

Cluster nodes

For advanced install only, your cluster nodes must have the following prerequisites. The cluster nodes are designated as masters and agents during installation.

Data compression (advanced installer)

You must have the UnZip, GNU tar, and XZ Utils data compression utilities installed on your cluster nodes.

To install these utilities on CentOS7 and RHEL7:

sudo yum install -y tar xz unzip curl ipset

Cluster permissions (advanced installer)

On each of your cluster nodes, use the following command to:

  • Disable SELinux or set it to permissive mode.

  • Add nogroup to each of your masters and agents.

  • Reboot your cluster for the changes to take effect.

    sudo sed -i s/SELINUX=enforcing/SELINUX=permissive/g /etc/selinux/config &&
    sudo groupadd nogroup &&
    sudo reboot

    Note: It may take a few minutes for your node to come back online after reboot.

Locale requirements

You must set the LC_ALL and LANG environment variables to en_US.utf-8.

Next steps