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ubuntu_hortonworks [2016/01/28 11:18] steve |
ubuntu_hortonworks [2016/01/28 11:21] steve |
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| Line 21: | Line 21: | ||
| </code> | </code> | ||
| - | Disable IPv6 in ''/etc/sysctl.conf'': | + | Disable IPv6 completely in ''/etc/sysctl.conf''. HortonWorks also recommends disabling swapping completely, and increasing max user instances: |
| <code> | <code> | ||
| Line 27: | Line 27: | ||
| net.ipv6.conf.default.disable_ipv6 = 1 | net.ipv6.conf.default.disable_ipv6 = 1 | ||
| net.ipv6.conf.lo.disable_ipv6 = 1 | net.ipv6.conf.lo.disable_ipv6 = 1 | ||
| + | vm.swappiness = 0 | ||
| + | fs.epoll.max_user_instances = 2048 | ||
| </code> | </code> | ||
| - | Also disable it for the running machine: | + | Disable it directly as well: |
| <code> | <code> | ||
| Line 35: | Line 37: | ||
| sysctl -w net.ipv6.conf.default.disable_ipv6=1 | sysctl -w net.ipv6.conf.default.disable_ipv6=1 | ||
| sysctl -w net.ipv6.conf.lo.disable_ipv6=1 | sysctl -w net.ipv6.conf.lo.disable_ipv6=1 | ||
| + | sysctl -w vm.swappiness=0 | ||
| + | sysctl -w fs.epoll.max_user_instances=2048 | ||
| + | </code> | ||
| + | |||
| + | HortonWorks recommends disabling transparent hugepages as well. Add to ''/etc/rc.local'': | ||
| + | |||
| + | <code> | ||
| + | echo never > /sys/kernel/mm/transparent_hugepage/enabled | ||
| + | echo never > /sys/kernel/mm/transparent_hugepage/defrag | ||
| </code> | </code> | ||
