Appendix A - Understanding Custom Installation Solutions
Cloudera hosts two types of software repositories that you can use to install products such as Cloudera Manager or CDH — repositories of RPM (RHEL and SLES) and Debian/Ubuntu packages, and parcel repositories, newly available with Cloudera Manager 4.5.
With parcels you can download, distribute and activate a new CDH version all from within Cloudera Manager. Further, only the Cloudera Manager server needs Internet access for downloading the desired parcel to a local repository on the Cloudera Manager server. Distribution of parcels to the remaining cluster members does not require internet access. Parcels are available for CDH 4.1.3 and onwards. Cloudera Manager continues to work with RPM (RHEL and SLES) and Debian/Ubuntu packages.
These repositories are effective solutions in most cases, but custom installation solutions are sometimes required. Using the software repositories requires client access over the Internet and results in the installation of the latest version of products.
An alternate solution is required if:
- You need to install older product versions. For example, in a CDH cluster, all hosts must run the same CDH version. After completing an initial installation, you may want to add nodes. This could be to increase the size of your cluster to handle larger tasks or to replace older hardware.
- The hosts on which you want to install Cloudera products are not connected to the Internet, so they are unable to reach the Cloudera repository. (Note that for a parcel installation, only the Cloudera manager server needs Internet access, but for a package installation, all cluster members need access to the Cloudera repository). Some organizations choose to partition parts of their network from outside access. Isolating segments of a network can provide greater assurance that valuable data is not compromised by individuals out of maliciousness or for personal gain. In such a case, the isolated computers are unable to access Cloudera's software repositories for new installations or upgrades.
In both of these cases, using a custom repository solution allows you to meet the needs of your organization, whether that means installing older versions of Cloudera software or installing any version of Cloudera software on machines that are disconnected from the Internet.