2017-02-21 23:09:05 ERROR juju.mongo mongo.go:552 could not set the value of "/sys/kernel/mm/transparent_hugepage/defrag" to "never" because of: open /sys/kernel/mm/transparent_hugepage/defrag: permission denied
2017-02-21 23:09:05 ERROR juju.mongo mongo.go:552 could not set the value of "/proc/sys/net/ipv4/tcp_max_syn_backlog" to "4096" because of: "/proc/sys/net/ipv4/tcp_max_syn_backlog" does not exist, will not set "4096"

same for "/proc/sys/net/core/somaxconn" and "/proc/sys/net/core/netdev_max_backlog"