Linux distribution support

Ensure that the host's Linux distribution and version supports a given parameter.

Cgroups are a feature of the Linux kernel, and as such, support depends on the host's Linux distribution and version as shown in the following tables. If a distribution lacks support for a given parameter, changes to the parameter have no effect.

Table 1. RHEL-compatible
Distribution CPU Shares I/O Weight Memory Soft Limit Memory Hard Limit
Red Hat Enterprise Linux, CentOS, and Oracle Enterprise Linux 7
Red Hat Enterprise Linux, CentOS, and Oracle Enterprise Linux 6
Table 2. SLES
Distribution CPU Shares I/O Weight Memory Soft Limit Memory Hard Limit
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server 11
Table 3. Ubuntu
Distribution CPU Shares I/O Weight Memory Soft Limit Memory Hard Limit
Ubuntu 16.04 LTS
Ubuntu 16.04 LTS
Ubuntu 14.04 LTS
Ubuntu 12.04 LTS
Table 4. Debian
Distribution CPU Shares I/O Weight Memory Soft Limit Memory Hard Limit
Debian 7.1
Debian 7.0
Debian 6.0
Table 5. Oracle linux (OL)
Distribution CPU Shares I/O Weight Memory Soft Limit Memory Hard Limit
Oracle linux 7
Oracle linux 6

The exact level of support can be found in the Cloudera Manager Agent log file, shortly after the Agent has started. In the log file, look for an entry like this:

Found cgroups capabilities: {
   'has_memory': True, 
   'default_memory_limit_in_bytes': 9223372036854775807, 
   'writable_cgroup_dot_procs': True, 
   'has_cpu': True, 
   'default_blkio_weight': 1000, 
   'default_cpu_shares': 1024, 
   'has_blkio': True}

The has_cpu and similar entries correspond directly to support for the CPU, I/O, and memory parameters.