293 lines
7.5 KiB
Bash
Executable file
293 lines
7.5 KiB
Bash
Executable file
#!/usr/bin/env bash
|
|
set -e
|
|
|
|
# bits of this were adapted from lxc-checkconfig
|
|
# see also https://github.com/lxc/lxc/blob/lxc-1.0.2/src/lxc/lxc-checkconfig.in
|
|
|
|
possibleConfigs=(
|
|
'/proc/config.gz'
|
|
"/boot/config-$(uname -r)"
|
|
"/usr/src/linux-$(uname -r)/.config"
|
|
'/usr/src/linux/.config'
|
|
)
|
|
|
|
if [ $# -gt 0 ]; then
|
|
CONFIG="$1"
|
|
else
|
|
: ${CONFIG:="${possibleConfigs[0]}"}
|
|
fi
|
|
|
|
if ! command -v zgrep &> /dev/null; then
|
|
zgrep() {
|
|
zcat "$2" | grep "$1"
|
|
}
|
|
fi
|
|
|
|
kernelVersion="$(uname -r)"
|
|
kernelMajor="${kernelVersion%%.*}"
|
|
kernelMinor="${kernelVersion#$kernelMajor.}"
|
|
kernelMinor="${kernelMinor%%.*}"
|
|
|
|
is_set() {
|
|
zgrep "CONFIG_$1=[y|m]" "$CONFIG" > /dev/null
|
|
}
|
|
is_set_in_kernel() {
|
|
zgrep "CONFIG_$1=y" "$CONFIG" > /dev/null
|
|
}
|
|
is_set_as_module() {
|
|
zgrep "CONFIG_$1=m" "$CONFIG" > /dev/null
|
|
}
|
|
|
|
color() {
|
|
local codes=()
|
|
if [ "$1" = 'bold' ]; then
|
|
codes=( "${codes[@]}" '1' )
|
|
shift
|
|
fi
|
|
if [ "$#" -gt 0 ]; then
|
|
local code=
|
|
case "$1" in
|
|
# see https://en.wikipedia.org/wiki/ANSI_escape_code#Colors
|
|
black) code=30 ;;
|
|
red) code=31 ;;
|
|
green) code=32 ;;
|
|
yellow) code=33 ;;
|
|
blue) code=34 ;;
|
|
magenta) code=35 ;;
|
|
cyan) code=36 ;;
|
|
white) code=37 ;;
|
|
esac
|
|
if [ "$code" ]; then
|
|
codes=( "${codes[@]}" "$code" )
|
|
fi
|
|
fi
|
|
local IFS=';'
|
|
echo -en '\033['"${codes[*]}"'m'
|
|
}
|
|
wrap_color() {
|
|
text="$1"
|
|
shift
|
|
color "$@"
|
|
echo -n "$text"
|
|
color reset
|
|
echo
|
|
}
|
|
|
|
wrap_good() {
|
|
echo "$(wrap_color "$1" white): $(wrap_color "$2" green)"
|
|
}
|
|
wrap_bad() {
|
|
echo "$(wrap_color "$1" bold): $(wrap_color "$2" bold red)"
|
|
}
|
|
wrap_warning() {
|
|
wrap_color >&2 "$*" red
|
|
}
|
|
|
|
check_flag() {
|
|
if is_set_in_kernel "$1"; then
|
|
wrap_good "CONFIG_$1" 'enabled'
|
|
elif is_set_as_module "$1"; then
|
|
wrap_good "CONFIG_$1" 'enabled (as module)'
|
|
else
|
|
wrap_bad "CONFIG_$1" 'missing'
|
|
fi
|
|
}
|
|
|
|
check_flags() {
|
|
for flag in "$@"; do
|
|
echo "- $(check_flag "$flag")"
|
|
done
|
|
}
|
|
|
|
check_command() {
|
|
if command -v "$1" >/dev/null 2>&1; then
|
|
wrap_good "$1 command" 'available'
|
|
else
|
|
wrap_bad "$1 command" 'missing'
|
|
fi
|
|
}
|
|
|
|
check_device() {
|
|
if [ -c "$1" ]; then
|
|
wrap_good "$1" 'present'
|
|
else
|
|
wrap_bad "$1" 'missing'
|
|
fi
|
|
}
|
|
|
|
check_distro_userns() {
|
|
source /etc/os-release 2>/dev/null || /bin/true
|
|
if [[ "${ID}" =~ ^(centos|rhel)$ && "${VERSION_ID}" =~ ^7 ]]; then
|
|
# this is a CentOS7 or RHEL7 system
|
|
grep -q "user_namespace.enable=1" /proc/cmdline || {
|
|
# no user namespace support enabled
|
|
wrap_bad " (RHEL7/CentOS7" "User namespaces disabled; add 'user_namespace.enable=1' to boot command line)"
|
|
}
|
|
fi
|
|
}
|
|
|
|
if [ ! -e "$CONFIG" ]; then
|
|
wrap_warning "warning: $CONFIG does not exist, searching other paths for kernel config ..."
|
|
for tryConfig in "${possibleConfigs[@]}"; do
|
|
if [ -e "$tryConfig" ]; then
|
|
CONFIG="$tryConfig"
|
|
break
|
|
fi
|
|
done
|
|
if [ ! -e "$CONFIG" ]; then
|
|
wrap_warning "error: cannot find kernel config"
|
|
wrap_warning " try running this script again, specifying the kernel config:"
|
|
wrap_warning " CONFIG=/path/to/kernel/.config $0 or $0 /path/to/kernel/.config"
|
|
exit 1
|
|
fi
|
|
fi
|
|
|
|
wrap_color "info: reading kernel config from $CONFIG ..." white
|
|
echo
|
|
|
|
echo 'Generally Necessary:'
|
|
|
|
echo -n '- '
|
|
cgroupSubsystemDir="$(awk '/[, ](cpu|cpuacct|cpuset|devices|freezer|memory)[, ]/ && $3 == "cgroup" { print $2 }' /proc/mounts | head -n1)"
|
|
cgroupDir="$(dirname "$cgroupSubsystemDir")"
|
|
if [ -d "$cgroupDir/cpu" -o -d "$cgroupDir/cpuacct" -o -d "$cgroupDir/cpuset" -o -d "$cgroupDir/devices" -o -d "$cgroupDir/freezer" -o -d "$cgroupDir/memory" ]; then
|
|
echo "$(wrap_good 'cgroup hierarchy' 'properly mounted') [$cgroupDir]"
|
|
else
|
|
if [ "$cgroupSubsystemDir" ]; then
|
|
echo "$(wrap_bad 'cgroup hierarchy' 'single mountpoint!') [$cgroupSubsystemDir]"
|
|
else
|
|
echo "$(wrap_bad 'cgroup hierarchy' 'nonexistent??')"
|
|
fi
|
|
echo " $(wrap_color '(see https://github.com/tianon/cgroupfs-mount)' yellow)"
|
|
fi
|
|
|
|
if [ "$(cat /sys/module/apparmor/parameters/enabled 2>/dev/null)" = 'Y' ]; then
|
|
echo -n '- '
|
|
if command -v apparmor_parser &> /dev/null; then
|
|
echo "$(wrap_good 'apparmor' 'enabled and tools installed')"
|
|
else
|
|
echo "$(wrap_bad 'apparmor' 'enabled, but apparmor_parser missing')"
|
|
echo -n ' '
|
|
if command -v apt-get &> /dev/null; then
|
|
echo "$(wrap_color '(use "apt-get install apparmor" to fix this)')"
|
|
elif command -v yum &> /dev/null; then
|
|
echo "$(wrap_color '(your best bet is "yum install apparmor-parser")')"
|
|
else
|
|
echo "$(wrap_color '(look for an "apparmor" package for your distribution)')"
|
|
fi
|
|
fi
|
|
fi
|
|
|
|
flags=(
|
|
NAMESPACES {NET,PID,IPC,UTS}_NS
|
|
DEVPTS_MULTIPLE_INSTANCES
|
|
CGROUPS CGROUP_CPUACCT CGROUP_DEVICE CGROUP_FREEZER CGROUP_SCHED CPUSETS MEMCG
|
|
KEYS
|
|
MACVLAN VETH BRIDGE BRIDGE_NETFILTER
|
|
NF_NAT_IPV4 IP_NF_FILTER IP_NF_TARGET_MASQUERADE
|
|
NETFILTER_XT_MATCH_{ADDRTYPE,CONNTRACK}
|
|
NF_NAT NF_NAT_NEEDED
|
|
|
|
# required for bind-mounting /dev/mqueue into containers
|
|
POSIX_MQUEUE
|
|
)
|
|
check_flags "${flags[@]}"
|
|
echo
|
|
|
|
echo 'Optional Features:'
|
|
{
|
|
check_flags USER_NS
|
|
check_distro_userns
|
|
}
|
|
{
|
|
check_flags SECCOMP
|
|
}
|
|
{
|
|
check_flags CGROUP_PIDS
|
|
}
|
|
{
|
|
check_flags MEMCG_SWAP MEMCG_SWAP_ENABLED
|
|
if is_set MEMCG_SWAP && ! is_set MEMCG_SWAP_ENABLED; then
|
|
echo " $(wrap_color '(note that cgroup swap accounting is not enabled in your kernel config, you can enable it by setting boot option "swapaccount=1")' bold black)"
|
|
fi
|
|
}
|
|
|
|
if [ "$kernelMajor" -lt 4 ] || [ "$kernelMajor" -eq 4 -a "$kernelMinor" -le 5 ]; then
|
|
check_flags MEMCG_KMEM
|
|
fi
|
|
|
|
if [ "$kernelMajor" -lt 3 ] || [ "$kernelMajor" -eq 3 -a "$kernelMinor" -le 18 ]; then
|
|
check_flags RESOURCE_COUNTERS
|
|
fi
|
|
|
|
if [ "$kernelMajor" -lt 3 ] || [ "$kernelMajor" -eq 3 -a "$kernelMinor" -le 13 ]; then
|
|
netprio=NETPRIO_CGROUP
|
|
else
|
|
netprio=CGROUP_NET_PRIO
|
|
fi
|
|
|
|
flags=(
|
|
BLK_CGROUP BLK_DEV_THROTTLING IOSCHED_CFQ CFQ_GROUP_IOSCHED
|
|
CGROUP_PERF
|
|
CGROUP_HUGETLB
|
|
NET_CLS_CGROUP $netprio
|
|
CFS_BANDWIDTH FAIR_GROUP_SCHED RT_GROUP_SCHED
|
|
IP_VS
|
|
)
|
|
check_flags "${flags[@]}"
|
|
|
|
check_flags EXT3_FS EXT3_FS_XATTR EXT3_FS_POSIX_ACL EXT3_FS_SECURITY
|
|
if ! is_set EXT3_FS || ! is_set EXT3_FS_XATTR || ! is_set EXT3_FS_POSIX_ACL || ! is_set EXT3_FS_SECURITY; then
|
|
echo " $(wrap_color '(enable these ext3 configs if you are using ext3 as backing filesystem)' bold black)"
|
|
fi
|
|
|
|
check_flags EXT4_FS EXT4_FS_POSIX_ACL EXT4_FS_SECURITY
|
|
if ! is_set EXT4_FS || ! is_set EXT4_FS_POSIX_ACL || ! is_set EXT4_FS_SECURITY; then
|
|
echo " $(wrap_color 'enable these ext4 configs if you are using ext4 as backing filesystem' bold black)"
|
|
fi
|
|
|
|
echo '- Network Drivers:'
|
|
{
|
|
echo '- "'$(wrap_color 'overlay' blue)'":'
|
|
check_flags VXLAN | sed 's/^/ /'
|
|
echo ' Optional (for secure networks):'
|
|
check_flags XFRM_ALGO XFRM_USER | sed 's/^/ /'
|
|
} | sed 's/^/ /'
|
|
|
|
echo '- Storage Drivers:'
|
|
{
|
|
echo '- "'$(wrap_color 'aufs' blue)'":'
|
|
check_flags AUFS_FS | sed 's/^/ /'
|
|
if ! is_set AUFS_FS && grep -q aufs /proc/filesystems; then
|
|
echo " $(wrap_color '(note that some kernels include AUFS patches but not the AUFS_FS flag)' bold black)"
|
|
fi
|
|
|
|
echo '- "'$(wrap_color 'btrfs' blue)'":'
|
|
check_flags BTRFS_FS | sed 's/^/ /'
|
|
|
|
echo '- "'$(wrap_color 'devicemapper' blue)'":'
|
|
check_flags BLK_DEV_DM DM_THIN_PROVISIONING | sed 's/^/ /'
|
|
|
|
echo '- "'$(wrap_color 'overlay' blue)'":'
|
|
check_flags OVERLAY_FS | sed 's/^/ /'
|
|
|
|
echo '- "'$(wrap_color 'zfs' blue)'":'
|
|
echo " - $(check_device /dev/zfs)"
|
|
echo " - $(check_command zfs)"
|
|
echo " - $(check_command zpool)"
|
|
} | sed 's/^/ /'
|
|
echo
|
|
|
|
check_limit_over()
|
|
{
|
|
if [ $(cat "$1") -le "$2" ]; then
|
|
wrap_bad "- $1" "$(cat $1)"
|
|
wrap_color " This should be set to at least $2, for example set: sysctl -w kernel/keys/root_maxkeys=1000000" bold black
|
|
else
|
|
wrap_good "- $1" "$(cat $1)"
|
|
fi
|
|
}
|
|
|
|
echo 'Limits:'
|
|
check_limit_over /proc/sys/kernel/keys/root_maxkeys 10000
|
|
echo
|