# from Alpine defaults
net.ipv4.tcp_syncookies = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.ping_group_range=999 59999
# general limits
vm.max_map_count = 262144
vm.overcommit_memory = 1
net.core.somaxconn = 1024
net.ipv4.neigh.default.gc_thresh1 = 80000
net.ipv4.neigh.default.gc_thresh2 = 90000
net.ipv4.neigh.default.gc_thresh3 = 100000
fs.aio-max-nr = 1048576
fs.inotify.max_user_watches = 524288
fs.file-max = 524288
# for rngd
kernel.random.write_wakeup_threshold = 3072
# security restrictions
kernel.kptr_restrict = 2
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv6.conf.all.accept_redirects = 0
net.ipv6.conf.default.accept_redirects = 0
kernel.dmesg_restrict = 1
kernel.perf_event_paranoid = 3
fs.protected_hardlinks = 1
fs.protected_symlinks = 1
# Prevent ebpf privilege escalation
# see: https://lwn.net/Articles/742170
kernel.unprivileged_bpf_disabled=1