Clean Code

01-old/packer/ansible/roles/docker/templates/sysctl.j2

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+#
+# /etc/sysctl.conf - Configuration file for setting system variables
+# See /etc/sysctl.d/ for additional system variables.
+# See sysctl.conf (5) for information.
+#
+
+#kernel.domainname = example.com
+
+# Uncomment the following to stop low-level messages on console
+#kernel.printk = 3 4 1 3
+
+###################################################################
+# Functions previously found in netbase
+#
+
+# Uncomment the next two lines to enable Spoof protection (reverse-path filter)
+# Turn on Source Address Verification in all interfaces to
+# prevent some spoofing attacks
+#net.ipv4.conf.default.rp_filter=1
+#net.ipv4.conf.all.rp_filter=1
+
+# Uncomment the next line to enable TCP/IP SYN cookies
+# See http://lwn.net/Articles/277146/
+# Note: This may impact IPv6 TCP sessions too
+#net.ipv4.tcp_syncookies=1
+
+# Uncomment the next line to enable packet forwarding for IPv4
+#net.ipv4.ip_forward=1
+
+# Uncomment the next line to enable packet forwarding for IPv6
+#  Enabling this option disables Stateless Address Autoconfiguration
+#  based on Router Advertisements for this host
+#net.ipv6.conf.all.forwarding=1
+
+
+###################################################################
+# Additional settings - these settings can improve the network
+# security of the host and prevent against some network attacks
+# including spoofing attacks and man in the middle attacks through
+# redirection. Some network environments, however, require that these
+# settings are disabled so review and enable them as needed.
+#
+# Do not accept ICMP redirects (prevent MITM attacks)
+#net.ipv4.conf.all.accept_redirects = 0
+#net.ipv6.conf.all.accept_redirects = 0
+# _or_
+# Accept ICMP redirects only for gateways listed in our default
+# gateway list (enabled by default)
+# net.ipv4.conf.all.secure_redirects = 1
+#
+# Do not send ICMP redirects (we are not a router)
+#net.ipv4.conf.all.send_redirects = 0
+#
+# Do not accept IP source route packets (we are not a router)
+#net.ipv4.conf.all.accept_source_route = 0
+#net.ipv6.conf.all.accept_source_route = 0
+#
+# Log Martian Packets
+#net.ipv4.conf.all.log_martians = 1
+#
+
+###################################################################
+# Magic system request Key
+# 0=disable, 1=enable all, >1 bitmask of sysrq functions
+# See https://www.kernel.org/doc/html/latest/admin-guide/sysrq.html
+# for what other values do
+#kernel.sysrq=438
+
+vm.dirty_background_ratio = 5
+vm.dirty_ratio = 80
+
+net.core.default_qdisc = fq
+net.core.rmem_max = 268435456
+net.core.wmem_max = 268435456
+net.ipv4.conf.all.arp_announce = 2
+net.ipv4.conf.all.arp_filter = 1
+net.ipv4.conf.all.arp_ignore = 1
+net.ipv4.conf.default.arp_filter = 1
+net.ipv4.tcp_congestion_control = htcp
+net.ipv4.tcp_no_metrics_save = 1
+net.ipv4.tcp_rmem = 4096 87380 134217728
+net.ipv4.tcp_wmem = 4096 65536 134217728