推荐两个Docker配置检查与启动异常修复方法脚本

#!/bin/sh
# Copyright 2011 Canonical, Inc
#           2014 Tianon Gravi
# Author: Serge Hallyn <serge.hallyn@canonical.com>
#         Tianon Gravi <tianon@debian.org>
set -e

# for simplicity this script provides no flexibility

# if cgroup is mounted by fstab, don't run
# don't get too smart - bail on any uncommented entry with 'cgroup' in it
if grep -v '^#' /etc/fstab | grep -q cgroup; then
 echo 'cgroups mounted from fstab, not mounting /sys/fs/cgroup'
 exit 0
fi

# kernel provides cgroups?
if [ ! -e /proc/cgroups ]; then
 exit 0
fi

# if we don't even have the directory we need, something else must be wrong
if [ ! -d /sys/fs/cgroup ]; then
 exit 0
fi

# mount /sys/fs/cgroup if not already done
if ! mountpoint -q /sys/fs/cgroup; then
 mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup
fi

cd /sys/fs/cgroup

# get/mount list of enabled cgroup controllers
for sys in $(awk '!/^#/ { if ($4 == 1) print $1 }' /proc/cgroups); do
 mkdir -p $sys
 if ! mountpoint -q $sys; then
  if ! mount -n -t cgroup -o $sys cgroup $sys; then
   rmdir $sys || true
  fi
 fi
done

# example /proc/cgroups:
#  #subsys_name hierarchy num_cgroups enabled
#  cpuset 2 3 1
#  cpu 3 3 1
#  cpuacct 4 3 1
#  memory 5 3 0
#  devices 6 3 1
#  freezer 7 3 1
#  blkio 8 3 1

# enable cgroups memory hierarchy, like systemd does (and lxc/docker desires)
# https://github.com/systemd/systemd/blob/v245/src/core/cgroup.c#L2983
# https://bugs.debian.org/940713
if [ -e /sys/fs/cgroup/memory/memory.use_hierarchy ]; then
 echo 1 > /sys/fs/cgroup/memory/memory.use_hierarchy
fi

exit 0

#!/usr/bin/env bash
set -e

EXITCODE=0

# 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'
  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
 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" ] || [ -d "$cgroupDir/cpuacct" ] || [ -d "$cgroupDir/cpuset" ] || [ -d "$cgroupDir/devices" ] || [ -d "$cgroupDir/freezer" ] || [ -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
  wrap_bad 'cgroup hierarchy' 'nonexistent??'
 fi
 EXITCODE=1
 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
  wrap_good 'apparmor' 'enabled and tools installed'
 else
  wrap_bad 'apparmor' 'enabled, but apparmor_parser missing'
  echo -n '    '
  if command -v apt-get &> /dev/null; then
   wrap_color '(use "apt-get install apparmor" to fix this)'
  elif command -v yum &> /dev/null; then
   wrap_color '(your best bet is "yum install apparmor-parser")'
  else
   wrap_color '(look for an "apparmor" package for your distribution)'
  fi
  EXITCODE=1
 fi
fi

flags=(
 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 ] || ([ "$kernelMajor" -eq 4 ] && [ "$kernelMinor" -lt 8 ]); then
 check_flags DEVPTS_MULTIPLE_INSTANCES
fi

echo

echo '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 ] && [ "$kernelMinor" -le 5 ]); then
 check_flags MEMCG_KMEM
fi

if [ "$kernelMajor" -lt 3 ] || ([ "$kernelMajor" -eq 3 ] && [ "$kernelMinor" -le 18 ]); then
 check_flags RESOURCE_COUNTERS
fi

if [ "$kernelMajor" -lt 3 ] || ([ "$kernelMajor" -eq 3 ] && [ "$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 $netprio
 CFS_BANDWIDTH FAIR_GROUP_SCHED RT_GROUP_SCHED
 IP_NF_TARGET_REDIRECT
 IP_VS
 IP_VS_NFCT
 IP_VS_PROTO_TCP
 IP_VS_PROTO_UDP
 IP_VS_RR
)
check_flags "${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)"
 fi
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
 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)"
 fi
fi

echo '- Network Drivers:'
echo "  - \"$(wrap_color 'overlay' blue)\":"
check_flags VXLAN BRIDGE_VLAN_FILTERING | sed 's/^/    /'
echo '      Optional (for encrypted networks):'
check_flags CRYPTO CRYPTO_AEAD CRYPTO_GCM CRYPTO_SEQIV CRYPTO_GHASH \
 XFRM XFRM_USER XFRM_ALGO INET_ESP INET_XFRM_MODE_TRANSPORT | sed 's/^/      /'
echo "  - \"$(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 available
CODE=${EXITCODE}
EXITCODE=0
STORAGE=1

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 "      $(wrap_color '(note that some kernels include AUFS patches but not the AUFS_FS flag)' bold black)"
fi
[ "$EXITCODE" = 0 ] && STORAGE=0
EXITCODE=0

echo "  - \"$(wrap_color 'btrfs' blue)\":"
check_flags BTRFS_FS | sed 's/^/    /'
check_flags BTRFS_FS_POSIX_ACL | sed 's/^/    /'
[ "$EXITCODE" = 0 ] && STORAGE=0
EXITCODE=0

echo "  - \"$(wrap_color 'devicemapper' blue)\":"
check_flags BLK_DEV_DM DM_THIN_PROVISIONING | sed 's/^/    /'
[ "$EXITCODE" = 0 ] && STORAGE=0
EXITCODE=0

echo "  - \"$(wrap_color 'overlay' blue)\":"
check_flags OVERLAY_FS | sed 's/^/    /'
[ "$EXITCODE" = 0 ] && STORAGE=0
EXITCODE=0

echo "  - \"$(wrap_color 'zfs' blue)\":"
echo -n "    - "
check_device /dev/zfs
echo -n "    - "
check_command zfs
echo -n "    - "
check_command zpool
[ "$EXITCODE" = 0 ] && STORAGE=0
EXITCODE=0

EXITCODE=$CODE
[ "$STORAGE" = 1 ] && EXITCODE=1

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
  EXITCODE=1
 else
  wrap_good "- $1" "$(cat "$1")"
 fi
}

echo 'Limits:'
check_limit_over /proc/sys/kernel/keys/root_maxkeys 10000
echo

exit $EXITCODE