Docker 需要kernel 經過設置一些開關，若沒設定會有基本的錯誤
例如docker daemon 啟動失敗、無法virtual network (導致不能啟動container)
以下有個官方腳本可以確認系統設置
#!/usr/bin/env bashset -eEXITCODE=0# bits of this were adapted from lxc-checkconfigpossibleConfigs=( '/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]}"}fiif ! command -v zgrep &> /dev/null; then zgrep() { zcat "$2" | grep "$1" }fikernelVersion="$(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 "$1" in black) code=30 ;; red) code=31 ;; green) code=32 ;; yellow) code=33 ;; blue) code=34 ;; magenta) code=35 ;; cyan) code=36 ;; white) code=37 ;; esac if [ "$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_$1" 'missing' EXITCODE=1 fi}check_flags() { for flag in "$@"; do echo -n "- "; 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' EXITCODE=1 fi}check_device() { if [ -c "$1" ]; then wrap_good "$1" 'present' else wrap_bad "$1" 'missing' EXITCODE=1 fi}check_distro_userns() { source /etc/os-release 2>/dev/null || /bin/true if [[ "${ID}" =~ ^(centos|rhel)$ && "${VERSION_ID}" =~ ^7 ]]; then # this is a CentOS7 or RHEL7 system grep -q "user_namespace.enable=1" /proc/cmdline || { # no user namespace support enabled wrap_bad " (RHEL7/CentOS7" "User namespaces disabled; add 'user_namespace.enable=1' to boot command line)" EXITCODE=1 } fi}if [ ! -e "$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 fifiwrap_color "info: reading kernel config from $CONFIG ..." whiteechoecho 'Generally Necessary:'echo -n '- 'cgroupSubsystemDir="$(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 "$(wrap_bad 'cgroup hierarchy' 'nonexistent??')" fi EXITCODE=1fiif [ "$(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 "$(wrap_color '(look for an "apparmor" package for your distribution)')" fi EXITCODE=1 fififlags=( NAMESPACES {NET,PID,IPC,UTS}_NS CGROUPS CGROUP_CPUACCT CGROUP_DEVICE CGROUP_FREEZER CGROUP_SCHED CPUSETS MEMCG KEYS VETH BRIDGE BRIDGE_NETFILTER NF_NAT_IPV4 IP_NF_FILTER IP_NF_TARGET_MASQUERADE NETFILTER_XT_MATCH_{ADDRTYPE,CONNTRACK,IPVS} IP_NF_NAT NF_NAT NF_NAT_NEEDED # required for bind-mounting /dev/mqueue into containers POSIX_MQUEUE)check_flags "${flags[@]}"if [ "$kernelMajor" -lt 4 ] || [ "$kernelMajor" -eq 4 -a "$kernelMinor" -lt 8 ]; then check_flags DEVPTS_MULTIPLE_INSTANCESfiechoecho 'Optional Features:'{ check_flags USER_NS check_distro_userns}{ check_flags SECCOMP}{ check_flags CGROUP_PIDS}{ CODE=${EXITCODE} check_flags MEMCG_SWAP MEMCG_SWAP_ENABLED if [ -e /sys/fs/cgroup/memory/memory.memsw.limit_in_bytes ]; then echo " $(wrap_color '(cgroup swap accounting is currently enabled)' bold black)" EXITCODE=${CODE} elif is_set MEMCG_SWAP && ! is_set MEMCG_SWAP_ENABLED; then echo " $(wrap_color '(cgroup swap accounting is currently not enabled, you can enable it by setting boot option "swapaccount=1")' bold black)" fi}{ if is_set LEGACY_VSYSCALL_NATIVE; then echo -n "- "; wrap_bad "CONFIG_LEGACY_VSYSCALL_NATIVE" 'enabled' echo " $(wrap_color '(dangerous, provides an ASLR-bypassing target with usable ROP gadgets.)' bold black)" elif is_set LEGACY_VSYSCALL_EMULATE; then echo -n "- "; wrap_good "CONFIG_LEGACY_VSYSCALL_EMULATE" 'enabled' elif is_set LEGACY_VSYSCALL_NONE; then echo -n "- "; wrap_bad "CONFIG_LEGACY_VSYSCALL_NONE" 'enabled' echo " $(wrap_color '(containers using eglibc <= 2.13 will not work. Switch to' bold black)" echo " $(wrap_color ' "CONFIG_VSYSCALL_[NATIVE|EMULATE]" or use "vsyscall=[native|emulate]"' bold black)" echo " $(wrap_color ' on kernel command line. Note that this will disable ASLR for the,' bold black)" echo " $(wrap_color ' VDSO which may assist in exploiting security vulnerabilities.)' bold black)" # else Older kernels (prior to 3dc33bd30f3e, released in v4.40-rc1) do # not have these LEGACY_VSYSCALL options and are effectively # LEGACY_VSYSCALL_EMULATE. Even older kernels are presumably # effectively LEGACY_VSYSCALL_NATIVE. fi}if [ "$kernelMajor" -lt 4 ] || [ "$kernelMajor" -eq 4 -a "$kernelMinor" -le 5 ]; then check_flags MEMCG_KMEMfiif [ "$kernelMajor" -lt 3 ] || [ "$kernelMajor" -eq 3 -a "$kernelMinor" -le 18 ]; then check_flags RESOURCE_COUNTERSfiif [ "$kernelMajor" -lt 3 ] || [ "$kernelMajor" -eq 3 -a "$kernelMinor" -le 13 ]; then netprio=NETPRIO_CGROUPelse netprio=CGROUP_NET_PRIOfiflags=( BLK_CGROUP BLK_DEV_THROTTLING IOSCHED_CFQ CFQ_GROUP_IOSCHED CGROUP_PERF CGROUP_HUGETLB NET_CLS_CGROUP $netprio CFS_BANDWIDTH FAIR_GROUP_SCHED RT_GROUP_SCHED IP_NF_TARGET_REDIRECT IP_VS IP_VS_NFCT IP_VS_PROTO_TCP IP_VS_PROTO_UDP IP_VS_RR)check_flags "${flags[@]}"if ! is_set EXT4_USE_FOR_EXT2; then 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)" fificheck_flags EXT4_FS EXT4_FS_POSIX_ACL EXT4_FS_SECURITYif ! is_set EXT4_FS || ! is_set EXT4_FS_POSIX_ACL || ! is_set EXT4_FS_SECURITY; then if is_set EXT4_USE_FOR_EXT2; then echo " $(wrap_color 'enable these ext4 configs if you are using ext3 or ext4 as backing filesystem' bold black)" else echo " $(wrap_color 'enable these ext4 configs if you are using ext4 as backing filesystem' bold black)" fifiecho '- Network Drivers:'echo ' - "'$(wrap_color 'overlay' blue)'":'check_flags VXLAN | sed 's/^/ /'echo ' Optional (for encrypted networks):'check_flags CRYPTO CRYPTO_AEAD CRYPTO_GCM CRYPTO_SEQIV CRYPTO_GHASH \ XFRM XFRM_USER XFRM_ALGO INET_ESP INET_XFRM_MODE_TRANSPORT | sed 's/^/ /'echo ' - "'$(wrap_color 'ipvlan' blue)'":'check_flags IPVLAN | sed 's/^/ /'echo ' - "'$(wrap_color 'macvlan' blue)'":'check_flags MACVLAN DUMMY | sed 's/^/ /'echo ' - "'$(wrap_color 'ftp,tftp client in container' blue)'":'check_flags NF_NAT_FTP NF_CONNTRACK_FTP NF_NAT_TFTP NF_CONNTRACK_TFTP | sed 's/^/ /'# only fail if no storage drivers availableCODE=${EXITCODE}EXITCODE=0STORAGE=1echo '- 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 " $(wrap_color '(note that some kernels include AUFS patches but not the AUFS_FS flag)' bold black)"fi[ "$EXITCODE" = 0 ] && STORAGE=0EXITCODE=0echo ' - "'$(wrap_color 'btrfs' blue)'":'check_flags BTRFS_FS | sed 's/^/ /'check_flags BTRFS_FS_POSIX_ACL | sed 's/^/ /'[ "$EXITCODE" = 0 ] && STORAGE=0EXITCODE=0echo ' - "'$(wrap_color 'devicemapper' blue)'":'check_flags BLK_DEV_DM DM_THIN_PROVISIONING | sed 's/^/ /'[ "$EXITCODE" = 0 ] && STORAGE=0EXITCODE=0echo ' - "'$(wrap_color 'overlay' blue)'":'check_flags OVERLAY_FS | sed 's/^/ /'[ "$EXITCODE" = 0 ] && STORAGE=0EXITCODE=0echo ' - "'$(wrap_color 'zfs' blue)'":'echo -n " - "; check_device /dev/zfsecho -n " - "; check_command zfsecho -n " - "; check_command zpool[ "$EXITCODE" = 0 ] && STORAGE=0EXITCODE=0EXITCODE=$CODE[ "$STORAGE" = 1 ] && EXITCODE=1echocheck_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 EXITCODE=1 else wrap_good "- $1" "$(cat $1)" fi}echo 'Limits:'check_limit_over /proc/sys/kernel/keys/root_maxkeys 10000echoexit $EXITCODE |
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