标签：docker资源限制 docker cpu限制 docker内存限制
之前介绍过如何使用ovs的qos技术对docker容器做网络资源限制，本次介绍如何使用docker本身的参数进行cpu与内存资源限制。
默认docker本身提供在创建容器的时候，进行内存、swap、cpu限制，但使用起来就得有些技巧需要注意，具体如下：
1、内存限制
默认docker内存限制可以使用-m参数进行限制，但如果仅-m参数，不添加其他，那么内存限制不会限制死，比如你-m 256m内存，那么容器里程序可以跑到256m*2=512m后才会被oom给杀死，
原因是源码里memory.memsw.limit_in_bytes 值是被设置成我们指定的内存参数的两倍。
源码地址是https://github.com/docker/libcontainer/blob/v1.2.0/cgroups/fs/memory.go#L39
内容如下
// By default, MemorySwap is set to twice the size of RAM.
// If you want to omit MemorySwap, set it to `-1‘.
if d.c.MemorySwap != -1 {
if err := writeFile(dir, "memory.memsw.limit_in_bytes", strconv.FormatInt(d.c.Memory*2, 10)); err != nil {
return err
}当然以上的内容都是有人发过的，不是我原创，地址是https://goldmann.pl/blog/2014/09/11/resource-management-in-docker/
下面是介绍一下我的测试过程
先限制内存为100m
docker run --restart always -d -m 100m --name=‘11‘ docker.ops-chukong.com:5000/centos6-base:5.0 /usr/bin/supervisord
然后登陆容器后使用stress进行内存测试
PS：怕大家不知道如何安装stress，我也简单介绍一下
rpm -Uvh http://pkgs.repoforge.org/stress/stress-1.0.2-1.el7.rf.x86_64.rpm
这一个命令就安装完成了
使用stress进行测试
stress --vm 1 --vm-bytes 190M --vm-hang 0
这个命令是跑190mM的内存
下面是跑的结果
10:11:35 # stress --vm 1 --vm-bytes 190M --vm-hang 0 stress: info: [282] dispatching hogs: 0 cpu, 0 io, 1 vm, 0 hdd stress: FAIL: [282] (420) <-- worker 283 got signal 9 stress: WARN: [282] (422) now reaping child worker processes stress: FAIL: [282] (456) failed run completed in 1s
可以看到程序死了，想查看程序死的原因可以去/var/log/messages里查看
May 22 10:11:06 ip-10-10-125-11 docker: 2015/05/22 10:11:06 http: multiple response.WriteHeader calls May 22 10:11:45 ip-10-10-125-11 kernel: stress invoked oom-killer: gfp_mask=0xd0, order=0, oom_score_adj=0 May 22 10:11:45 ip-10-10-125-11 kernel: stress cpuset=docker-6ae152aa189f2596249a56a2e9c414ae70addc55a2fe495b93e7420fc64758d5.scope mems_allowed=0-1 May 22 10:11:45 ip-10-10-125-11 kernel: CPU: 7 PID: 37242 Comm: stress Not tainted 3.10.0-229.el7.x86_64 #1 May 22 10:11:45 ip-10-10-125-11 kernel: Hardware name: Dell Inc. PowerEdge R720/01XT2D, BIOS 2.0.19 08/29/2013 May 22 10:11:45 ip-10-10-125-11 kernel: ffff88041780a220 0000000019d4767f ffff8807c189b808 ffffffff81604b0a May 22 10:11:45 ip-10-10-125-11 kernel: ffff8807c189b898 ffffffff815ffaaf 0000000000000046 ffff880418462d80 May 22 10:11:45 ip-10-10-125-11 kernel: ffff8807c189b870 ffff8807c189b868 ffffffff81159fb6 ffff8803f55fc9a8 May 22 10:11:45 ip-10-10-125-11 kernel: Call Trace: May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff81604b0a>] dump_stack+0x19/0x1b May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff815ffaaf>] dump_header+0x8e/0x214 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff81159fb6>] ? find_lock_task_mm+0x56/0xc0 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff8115a44e>] oom_kill_process+0x24e/0x3b0 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff8107bdde>] ? has_capability_noaudit+0x1e/0x30 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff811bd5ae>] __mem_cgroup_try_charge+0xb9e/0xbe0 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff811bdd80>] ? mem_cgroup_charge_common+0xc0/0xc0 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff811bdd19>] mem_cgroup_charge_common+0x59/0xc0 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff811bf96a>] mem_cgroup_cache_charge+0x8a/0xb0 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff811571a2>] __add_to_page_cache_locked+0x52/0x260 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff81157407>] add_to_page_cache_lru+0x37/0xb0 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff812070f5>] mpage_readpages+0xb5/0x160 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffffa020b310>] ? _ext4_get_block+0x1b0/0x1b0 [ext4] May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffffa020b310>] ? _ext4_get_block+0x1b0/0x1b0 [ext4] May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffffa0208f0c>] ext4_readpages+0x3c/0x40 [ext4] May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff8116333c>] __do_page_cache_readahead+0x1cc/0x250 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff81163981>] ra_submit+0x21/0x30 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff81158f1d>] filemap_fault+0x11d/0x430 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff8117e63e>] __do_fault+0x7e/0x520 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff81182995>] handle_mm_fault+0x3d5/0xd70 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff81189396>] ? mmap_region+0x186/0x610 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff8160fe06>] __do_page_fault+0x156/0x540 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff81189b25>] ? do_mmap_pgoff+0x305/0x3c0 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff81173f89>] ? vm_mmap_pgoff+0xb9/0xe0 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff8161020a>] do_page_fault+0x1a/0x70 May 22 10:11:45 ip-10-10-125-11 kernel: [<ffffffff8160c408>] page_fault+0x28/0x30 May 22 10:11:45 ip-10-10-125-11 kernel: Task in /system.slice/docker-6ae152aa189f2596249a56a2e9c414ae70addc55a2fe495b93e7420fc64758d5.scope killed as a result of limit of /system.slice/docker-6ae152aa189f2596249a56a2e9c414ae70addc55a2fe495b93e7420fc64758d5.scope May 22 10:11:45 ip-10-10-125-11 kernel: memory: usage 101144kB, limit 102400kB, failcnt 10934 May 22 10:11:45 ip-10-10-125-11 kernel: memory+swap: usage 204800kB, limit 204800kB, failcnt 37 May 22 10:11:45 ip-10-10-125-11 kernel: kmem: usage 0kB, limit 9007199254740991kB, failcnt 0 May 22 10:11:45 ip-10-10-125-11 kernel: Memory cgroup stats for /system.slice/docker-6ae152aa189f2596249a56a2e9c414ae70addc55a2fe495b93e7420fc64758d5.scope: cache:80KB rss:101064KB rss_huge:90112KB mapped_file:0KB swap:103656KB inactive_anon:72136KB active_anon:28928KB inactive_file:56KB active_file:24KB unevictable:0KB May 22 10:11:45 ip-10-10-125-11 kernel: [ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name May 22 10:11:45 ip-10-10-125-11 kernel: [34515] 0 34515 24879 302 54 1947 0 supervisord May 22 10:11:45 ip-10-10-125-11 kernel: [34531] 0 34531 16674 0 38 179 0 sshd May 22 10:11:45 ip-10-10-125-11 kernel: [34542] 0 34542 5115 9 14 141 0 crond May 22 10:11:45 ip-10-10-125-11 kernel: [34544] 0 34544 42841 0 20 101 0 rsyslogd May 22 10:11:45 ip-10-10-125-11 kernel: [35344] 0 35344 4359 0 11 52 0 anacron May 22 10:11:45 ip-10-10-125-11 kernel: [36682] 0 36682 2873 38 10 58 0 bash May 22 10:11:45 ip-10-10-125-11 kernel: [37241] 0 37241 1643 1 8 22 0 stress May 22 10:11:45 ip-10-10-125-11 kernel: [37242] 0 37242 50284 23693 103 24637 0 stress May 22 10:11:45 ip-10-10-125-11 kernel: Memory cgroup out of memory: Kill process 37242 (stress) score 945 or sacrifice child May 22 10:11:45 ip-10-10-125-11 kernel: Killed process 37242 (stress) total-vm:201136kB, anon-rss:94772kB, file-rss:0kB
显示内存使用超过2倍限制的内存，所以进行oom kill掉stress的进程，但容器不会死，仍然能正常运行。
但如果你想写死内存，可以使用
-m 100m --memory-swap=100m
这样就直接限制死，只要程序内存使用超过100m，那么就会被oom给kill。
2、cpu限制
目前cpu限制可以使用绑定到具体的线程，或者是在绑定线程基础上对线程资源权重分配。
绑定线程可以使用参数--cpuset-cpus=7（注意1.6版本才是--cpuset-cpus，1.6版本以下是--cpuset）
分配线程资源使用可以使用参数-c
具体的cpu如何使用与测试，参考上面国外朋友写的文章，很全面。
我这里注意介绍一下我这里平台cpu在容器里是如何使用？
我这里平台是直接把docker弄成iaas平台，然后在这个iaas基础上跑paas；其他的docker云基本都是在openstack的iaas或者其他的iaas里跑docker做paas。
内存使用我是直接限制为256m、512m、1g，cpu默认都是0.2c。
c的概念是cpu线程，比如你top的时候，使用1命令可以直接看到系统里有多少线程，以16个线程为例，我保留2个c给宿主机系统使用，另外14个c给docker使用，一个c有5个容器共同使用，最少可以使用20%资源，也就是0.2c，最多可以使用100%资源，也就是1c。
这样好处是线程不忙的时候，容器可以独享100%资源，资源紧张的时候，也就保证自己有20%的资源使用，另外同一台宿主机的容器即使某个资源使用多，也不好太影响其他c的容器。
我这里测试环境出现过某个项目，在进行压力测试的时候，由于没有对容器做资源限制，导致测试中把宿主机压测挂了，导致同台宿主机所有容器都无法访问。
错误如下图
讲了一大堆内存与cpu资源限制，基本别人都多多少少的结束过，我在介绍一下我独有的。
3、模块化进行cpu、内存、网络资源限制
可以使用先是脚本进行一键化的配置下面功能容器：
1、持久化独立ip；
2、可以做系统描述符配置；
3、可以限制内存使用资源；
4、可以限制网络使用资源；
5、可以自动绑定cpu线程；
6、可以出现故障时自动重启容器；
7、支持容器使用密码或者key验证；
下面是创建容器的过程
1、创建密码验证的
内存是256m，网络资源1m（bit），使用密码验证，文件描述符是65535
[root@ip-10-10-125-8 docker_code]# python create_docker_container_multi.py test1 docker.ops-chukong.com:5000/centos6-base:5.0 /usr/bin/supervisord 256m 1 passwd "123123" 65535
{‘Container_id‘: ‘522b5a91838375657c5ebba6f8b43d737dd7290cfad46803ba663a70ef789555‘, ‘Container_gateway_ip‘: u‘172.16.0.14‘, ‘Memory_limit‘: ‘256m‘, ‘Cpu_share‘: ‘3‘, ‘Container_status‘: ‘running‘, ‘Physics_ip‘: ‘10.10.125.8‘, ‘Container_create‘: ‘2015.06.09-10:47:41‘, ‘Container_name‘: ‘test1‘, ‘Cpu_core‘: ‘14‘, ‘Network_limit‘: ‘1‘, ‘Container_gateway_bridge‘: ‘ovs2‘, ‘Container_ip‘: u‘172.16.2.164/16‘}测试
[root@ip-10-10-125-8 docker_code]# ssh 172.16.2.164 root@172.16.2.164‘s password: Last login: Fri Mar 13 13:53:37 2015 from 172.17.42.1 root@522b5a918383:~ 10:48:56 # ifconfig eth1 eth1 Link encap:Ethernet HWaddr 86:44:D4:F5:5C:01 inet addr:172.16.2.164 Bcast:0.0.0.0 Mask:255.255.0.0 inet6 addr: fe80::8444:d4ff:fef5:5c01/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:96 errors:0 dropped:0 overruns:0 frame:0 TX packets:75 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:12261 (11.9 KiB) TX bytes:10464 (10.2 KiB) root@522b5a918383:~ 10:48:59 # ulimit -a core file size (blocks, -c) unlimited data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 128596 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 65535 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 1048576 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited
内存的话，使用docker stats模块查看
[root@ip-10-10-125-8 docker_code]# docker stats test1 CONTAINER CPU % MEM USAGE/LIMIT MEM % NET I/O test1 0.00% 30.7 MiB/256 MiB 11.99% 0 B/0 B
可以看到就是256m的内存限制
网络的话，我通过wget下载iso文件来测试
root@522b5a918383:~ 10:50:20 # wget -S -O /dev/null http://mirror.neu.edu.cn/centos/7/isos/x86_64/CentOS-7-x86_64-DVD-1503-01.iso --2015-06-09 10:51:04-- http://mirror.neu.edu.cn/centos/7/isos/x86_64/CentOS-7-x86_64-DVD-1503-01.iso Resolving mirror.neu.edu.cn... 202.118.1.64, 2001:da8:9000::64 Connecting to mirror.neu.edu.cn|202.118.1.64|:80... connected. HTTP request sent, awaiting response... HTTP/1.1 200 OK Server: nginx/1.0.4 Date: Tue, 09 Jun 2015 02:44:48 GMT Content-Type: application/octet-stream Content-Length: 4310695936 Last-Modified: Wed, 01 Apr 2015 00:05:50 GMT Connection: keep-alive Accept-Ranges: bytes Length: 4310695936 (4.0G) [application/octet-stream] Saving to: “/dev/null” 0% [ ] 884,760 117K/s eta 9h 54m
可以看到下载速度是1m（bit）/8=117k（byte）。
在测试一下持久化固定ip，重启容器
[root@ip-10-10-125-8 docker_code]# docker restart test1 test1 [root@ip-10-10-125-8 docker_code]# docker exec test1 ifconfig lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
可以看到重启后容器ip没了，但我有另外的一个脚本，会在发现容器没有ip后自动的把ip以及之前的配置重新给予（在crontab里每分钟运行一次）。
[root@ip-10-10-125-8 docker_code]# docker exec test1 ifconfig eth1 Link encap:Ethernet HWaddr B6:6D:BC:CC:CD:69 inet addr:172.16.2.164 Bcast:0.0.0.0 Mask:255.255.0.0 inet6 addr: fe80::b46d:bcff:fecc:cd69/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:8 errors:0 dropped:0 overruns:0 frame:0 TX packets:9 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:648 (648.0 b) TX bytes:690 (690.0 b) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) [root@ip-10-10-125-8 docker_code]#
可以看到ip重新赋予了，实现了持久化固定ip功能。
下面是创建过程中使用的脚本.大家参考就行，没必要直接复制使用，每个人的需求都是不一样的。
[root@ip-10-10-125-8 docker_code]# cat create_docker_container_multi.py
#!/usr/bin/env python
#-*- coding: utf-8 -*-
#author:Deng Lei
#email: dl528888@gmail.com
import sys
import etcd
import time
import socket, struct, fcntl
from docker import Client
import subprocess
from multiprocessing import cpu_count
#get local host ip
def get_local_ip(iface = ‘em1‘):
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sockfd = sock.fileno()
SIOCGIFADDR = 0x8915
ifreq = struct.pack(‘16sH14s‘, iface, socket.AF_INET, ‘\x00‘*14)
try:
res = fcntl.ioctl(sockfd, SIOCGIFADDR, ifreq)
except:
return None
ip = struct.unpack(‘16sH2x4s8x‘, res)[2]
return socket.inet_ntoa(ip)
def docker_container_all():
docker_container=docker_client.containers(all=True)
container_name=[]
container_stop_name=[]
for i in docker_container:
container_name.append(i[‘Names‘])
for b in container_name:
for c in b:
container_stop_name.append(c[1:])
return container_stop_name
def get_now_cpu_core():
#get recycle cpu use in etcd
recycle_cpu_key=‘%s%s/resource_limit/cpu_limit/now_cpu_core_avaiable‘%(docker_etcd_key,local_ip)
try:
all_recycle_cpu_result=eval(etcd_client.read(recycle_cpu_key).value)
except etcd.EtcdKeyNotFound:
all_recycle_cpu_result=‘‘
if len(all_recycle_cpu_result) > 0:
now_core={}
now_core[‘now_core‘]=all_recycle_cpu_result[0].split(‘-‘)[0]
now_core[‘now_core_share‘]=all_recycle_cpu_result[0].split(‘-‘)[1]
all_recycle_cpu_result.remove(all_recycle_cpu_result[0])
etcd_client.write(recycle_cpu_key,all_recycle_cpu_result)
return now_core
else:
#get local core use in etcd
now_core={‘count‘:cpu_core,‘now_core‘:cpu_core-1,‘core_share_limit‘:cpu_core_share_limit,‘now_core_share‘:-1}
try:
now_core_use=eval(etcd_client.read(‘%s%s/resource_limit/cpu_limit/now_cpu_core‘%(docker_etcd_key,local_ip)).value)
except KeyError:
now_core_use=now_core
etcd_client.write(‘%s%s/resource_limit/cpu_limit/now_cpu_core‘%(docker_etcd_key,local_ip),now_core)
time.sleep(1)
except etcd.EtcdKeyNotFound:
now_core_use=now_core
etcd_client.write(‘%s%s/resource_limit/cpu_limit/now_cpu_core‘%(docker_etcd_key,local_ip),now_core)
time.sleep(1)
if int(now_core_use[‘now_core‘]) == int((cpu_core_retain - 1)):
msg={‘status‘:1,‘resource‘:‘cpu‘,‘result‘:‘the avaiable cpu core is less than retain:%s,i can not create new container!‘%cpu_core_retain}
print msg
sys.exit(1)
else:
if int(now_core_use[‘now_core_share‘]+1) >= int(now_core_use[‘core_share_limit‘]):
now_core_use[‘now_core‘]=now_core_use[‘now_core‘]-1
if int(now_core_use[‘now_core‘]) == int((cpu_core_retain - 1)):
msg={‘status‘:1,‘resource‘:‘cpu‘,‘result‘:‘the avaiable cpu core is less than retain:%s,i can not create new container!‘%cpu_core_retain}
print msg
sys.exit(1)
else:
now_core_use[‘now_core_share‘]=0
else:
now_core_use[‘now_core_share‘]=now_core_use[‘now_core_share‘]+1
etcd_client.write(‘%s%s/resource_limit/cpu_limit/now_cpu_core‘%(docker_etcd_key,local_ip),now_core_use)
return now_core_use
def get_container_ip():
#get avaiable container ip
recycle_ip_key=‘%scontainer/now_ip_avaiable‘%docker_etcd_key
try:
all_recycle_ip_result=eval(etcd_client.read(recycle_ip_key).value)
except etcd.EtcdKeyNotFound:
all_recycle_ip_result=‘‘
if len(all_recycle_ip_result) > 0:
now_recycle_ip=all_recycle_ip_result[0]
all_recycle_ip_result.remove(all_recycle_ip_result[0])
etcd_client.write(recycle_ip_key,all_recycle_ip_result)
return now_recycle_ip
else:
#get new container ip
try:
now_container_ip=etcd_client.read(‘%scontainer/now_ip‘%(docker_etcd_key)).value
except KeyError:
now_container_ip=default_container_ip
except etcd.EtcdKeyNotFound:
now_container_ip=default_container_ip
ip=now_container_ip.split(‘/‘)[0]
netmask=now_container_ip.split(‘/‘)[1]
if int(ip.split(‘.‘)[-1]) <254:
new_container_ip=‘.‘.join(ip.split(‘.‘)[0:3])+‘.‘+str(int(ip.split(‘.‘)[-1])+1)+‘/‘+netmask
elif int(ip.split(‘.‘)[-1]) >=254 and int(ip.split(‘.‘)[-2]) <254:
if int(ip.split(‘.‘)[-1]) ==254:
last_ip=‘1‘
else:
last_ip=int(ip.split(‘.‘)[-1])+1
new_container_ip=‘.‘.join(ip.split(‘.‘)[0:2])+‘.‘+str(int(ip.split(‘.‘)[-2])+1)+‘.‘+last_ip+‘/‘+netmask
elif int(ip.split(‘.‘)[-2]) <=254 and int(ip.split(‘.‘)[-3])<254:
if int(ip.split(‘.‘)[-1]) == 254:
last_ip=‘1‘
else:
last_ip=int(ip.split(‘.‘)[-1])+1
new_container_ip=‘.‘.join(ip.split(‘.‘)[0:2])+‘.‘+str(int(ip.split(‘.‘)[2])+1)+‘.‘+last_ip+‘/‘+netmask
elif int(ip.split(‘.‘)[-2]) ==255 and int(ip.split(‘.‘)[-1])==254:
print ‘now ip had more than ip pool!‘
sys.exit(1)
etcd_client.write(‘%scontainer/now_ip‘%docker_etcd_key,new_container_ip)
return new_container_ip
if __name__ == "__main__":
bridge=‘ovs2‘
default_physics_ip=‘172.16.0.1/16‘
default_container_ip=‘172.16.1.1/16‘
email=‘244979152@qq.com‘
local_ip=get_local_ip(‘ovs1‘)
if local_ip is None:
local_ip=get_local_ip(‘em1‘)
docker_etcd_key=‘/app/docker/‘
try:
container=sys.argv[1]
if container == "-h" or container == "-help":
print ‘Usage: container_name container_image command‘
sys.exit(1)
except IndexError:
print ‘print input container name!‘
sys.exit(1)
try:
images=sys.argv[2]
except IndexError:
print ‘print input images!‘
sys.exit(1)
try:
daemon_program=sys.argv[3]
except IndexError:
print ‘please input run image commmand!‘
sys.exit(1)
try:
memory_limit=sys.argv[4]
except IndexError:
print ‘please input memory limit where unit = b, k, m or g!‘
sys.exit(1)
try:
network_limit=sys.argv[5]
except IndexError:
print ‘please input network limit where unit = M!‘
sys.exit(1)
try:
ssh_method=sys.argv[6]
except IndexError:
print ‘please input container ssh auth method by key or passwd!‘
sys.exit(1)
try:
ssh_auth=sys.argv[7]
except IndexError:
print ‘please input container ssh auth passwd or key_context!‘
sys.exit(1)
try:
ulimit=sys.argv[8]
except IndexError:
ulimit=65535
etcd_client=etcd.Client(host=‘127.0.0.1‘, port=4001)
cpu_core=cpu_count()
cpu_core_retain=2
cpu_core_share_limit=5
local_dir=sys.path[0]
#get local core use in etcd
now_core=get_now_cpu_core()
docker_client = Client(base_url=‘unix://var/run/docker.sock‘, version=‘1.15‘, timeout=10)
docker_container_all_name=docker_container_all()
#check input container exist
if container in docker_container_all_name:
print ‘The container %s is exist!‘%container
sys.exit(1)
#check pipework software exist
check_pipework_status=((subprocess.Popen("which pipework &>>/dev/null && echo 0 || echo 1",shell=True,stdout=subprocess.PIPE)).stdout.readlines()[0]).strip(‘\n‘)
if check_pipework_status != "0":
print ‘I can not find pipework in this host!‘
sys.exit(1)
#check ovs bridge
check_bridge_status=((subprocess.Popen("ovs-vsctl list-br |grep %s &>>/dev/null && echo 0 || echo 1"%bridge,shell=True,stdout=subprocess.PIPE)).stdout.readlines()[0]).strip(‘\n‘)
if check_bridge_status !="0":
subprocess.Popen("ovs-vsctl add-br %s"%bridge,shell=True,stdout=subprocess.PIPE)
#check default physics ip
try:
default_physics_ip=etcd_client.read(‘%sphysics/now_ip‘%(docker_etcd_key)).value
except KeyError:
default_physics_ip=default_physics_ip
etcd_client.write(‘%sphysics/now_ip‘%docker_etcd_key,default_physics_ip)
time.sleep(1)
except etcd.EtcdKeyNotFound:
default_physics_ip=default_physics_ip
etcd_client.write(‘%sphysics/now_ip‘%docker_etcd_key,default_physics_ip)
time.sleep(1)
#check physics ip
try:
new_physics_ip=etcd_client.read(‘%sphysics/%s‘%(docker_etcd_key,local_ip)).value
except KeyError:
now_physics_ip=etcd_client.read(‘%sphysics/now_ip‘%(docker_etcd_key)).value
ip=now_physics_ip.split(‘/‘)[0]
netmask=now_physics_ip.split(‘/‘)[1]
if int(ip.split(‘.‘)[-1]) <254:
new_physics_ip=‘.‘.join(ip.split(‘.‘)[0:3])+‘.‘+str(int(ip.split(‘.‘)[-1])+1)+‘/‘+netmask
elif int(ip.split(‘.‘)[-1]) >=254:
print ‘physics gateway ip more than set up ip pool!‘
sys.exit(1)
etcd_client.write(‘%sphysics/now_ip‘%docker_etcd_key,new_physics_ip)
etcd_client.write(‘%sphysics/%s‘%(docker_etcd_key,local_ip),new_physics_ip)
except etcd.EtcdKeyNotFound:
now_physics_ip=etcd_client.read(‘%sphysics/now_ip‘%(docker_etcd_key)).value
ip=now_physics_ip.split(‘/‘)[0]
netmask=now_physics_ip.split(‘/‘)[1]
if int(ip.split(‘.‘)[-1]) <254:
new_physics_ip=‘.‘.join(ip.split(‘.‘)[0:3])+‘.‘+str(int(ip.split(‘.‘)[-1])+1)+‘/‘+netmask
elif int(ip.split(‘.‘)[-1]) >=254:
print ‘physics gateway ip more than set up ip pool!‘
sys.exit(1)
etcd_client.write(‘%sphysics/now_ip‘%docker_etcd_key,new_physics_ip)
etcd_client.write(‘%sphysics/%s‘%(docker_etcd_key,local_ip),new_physics_ip)
#set physics ip
#run_command="awk -v value=`ifconfig %s|grep inet|grep -v inet6|awk ‘{print $2}‘|wc -l` ‘BEGIN{if(value<1) {system(‘/sbin/ifconfig %s %s‘)}}‘"%(bridge,bridge,new_physics_ip)
set_physics_status=((subprocess.Popen("/sbin/ifconfig %s %s && echo 0 || echo 1"%(bridge,new_physics_ip),shell=True,stdout=subprocess.PIPE)).stdout.readlines()[0]).strip(‘\n‘)
if set_physics_status !="0":
print ‘config local physics ip:%s is fail!‘%new_physics_ip
sys.exit(1)
docker_version=docker_client.version()[‘Version‘][0:3]
if float(docker_version) >= 1.6 :
cpu_tag=‘--cpuset-cpus‘
container_ulimit="--ulimit nofile=%s:%s"%(ulimit,ulimit)
else:
cpu_tag=‘--cpuset‘
container_ulimit=‘‘
#create new container
get_container_id=((subprocess.Popen("docker run --restart always %s -d -m %s --memory-swap=%s %s=%s --net=‘none‘ --name=‘%s‘ %s %s"%(container_ulimit,memory_limit,memory_limit,cpu_tag,now_core[‘now_core‘],container,images,daemon_program),shell=True,stdout=subprocess.PIPE)).stdout.readlines()[0]).strip(‘\n‘)
check_container_status=((subprocess.Popen("docker inspect %s|grep Id &>>/dev/null && echo 0 || echo 1"%(container),shell=True,stdout=subprocess.PIPE)).stdout.readlines()[0]).strip(‘\n‘)
if check_container_status !="0":
print ‘Create container %s is fail!‘%container
sys.exit(1)
#get container ip
new_container_ip=get_container_ip()
#check container network
new_physics_ip=new_physics_ip.split(‘/‘)[0]
set_container_status=((subprocess.Popen("`which pipework` %s %s %s@%s &>>/dev/null && echo 0 || echo 1"%(bridge,container,new_container_ip,new_physics_ip),shell=True,stdout=subprocess.PIPE)).stdout.readlines()[0]).strip(‘\n‘)
if set_container_status != "0":
print ‘config container:%s network is fail!‘%container
sys.exit(1)
#set container network limit
set_container_network_limit=((subprocess.Popen("/bin/bash %s/modify_docker_container_network_limit.sh limit %s %s &>>/dev/null && echo 0 || echo 1"%(local_dir,container,network_limit),shell=True,stdout=subprocess.PIPE)).stdout.readlines()[0]).strip(‘\n‘)
if set_container_network_limit != "0":
print ‘config container:%s network limit:%s is fail!‘%(container,network_limit)
sys.exit(1)
#write container network limit to etcd
etcd_client.write(‘%s%s/resource_limit/network_limit/%s‘%(docker_etcd_key,local_ip,container),network_limit)
#modify container ssh auth
if ssh_method == ‘key‘:
cmd=‘docker exec %s sh -c "echo \‘%s\‘ >>/root/.ssh/authorized_keys && echo 0 || echo 1"‘%(container,ssh_auth)
elif ssh_method == ‘passwd‘:
cmd=‘docker exec %s sh -c "echo "%s" | passwd --stdin root &>>/dev/null && echo 0 || echo 1"‘%(container,ssh_auth)
check_ssh_status=((subprocess.Popen(cmd,shell=True,stdout=subprocess.PIPE)).stdout.readlines()[0]).strip(‘\n‘)
if check_ssh_status != "0":
print ‘config container:%s ssh auth method:%s is fail!‘%(container,ssh_method)
delete_cmd=‘docker rm $(docker stop %s)‘%container
delete_ssh_status=((subprocess.Popen(delete_cmd,shell=True,stdout=subprocess.PIPE)).stdout.readlines()[0]).strip(‘\n‘)
sys.exit(1)
#write container info to etcd
key=‘%s%s/container/%s‘%(docker_etcd_key,local_ip,container)
value={‘Physics_ip‘:‘%s‘%local_ip,‘Container_id‘:get_container_id,‘Container_name‘:container,‘Container_ip‘:‘%s‘%new_container_ip,‘Container_gateway_bridge‘:bridge,‘Container_gateway_ip‘:new_physics_ip,‘Container_create‘:time.strftime(‘%Y.%m.%d-%T‘),‘Container_status‘:‘running‘,‘Cpu_core‘:now_core[‘now_core‘],‘Cpu_share‘:now_core[‘now_core_share‘],‘Memory_limit‘:memory_limit,‘Network_limit‘:network_limit}
etcd_client.write(key,value)
#print ‘create container:%s is success.follow is container info.‘%container
print value这个脚本是创建容器并进行资源限制的
下面脚本是进行网络资源限制，上面脚本会调用做网络限制
[root@ip-10-10-125-8 docker_code]# cat modify_docker_container_network_limit.sh
#!/bin/bash
#filename:modify_docker_container_network_limit.sh
#author:Deng Lei
#email:dl528888@gmail.com
op=$1
container=$2
limit=$3 # Mbits/s
if [ -z $1 ] || [ -z $2 ]; then
echo "Usage: operation container_name limit(default:5m)"
echo "Example1: I want limit 5m in the container:test"
echo "The command is: bash `basename $0` limit test 5"
echo "Example2: I want delete network limit in the container:test"
echo "The command is: bash `basename $0` ulimit test"
exit 1
fi
if [ -z $3 ];then
limit=‘5m‘
fi
if [ `docker inspect --format "{{.State.Pid}}" $container &>>/dev/null && echo 0 || echo 1` -eq 1 ];then
echo "no this container:$container"
exit 1
fi
ovs_prefix=‘veth1pl‘
container_id=`docker inspect --format "{{.State.Pid}}" $container`
device_name=`echo ${ovs_prefix}${container_id}`
docker_etcd_key=‘/app/docker/‘
local_ip=`ifconfig ovs1|grep inet|awk ‘{print $2}‘|head -n1`
if [ $op == ‘limit‘ ];then
for v in $device_name; do
ovs-vsctl set interface $v ingress_policing_rate=$((limit*1000))
ovs-vsctl set interface $v ingress_policing_burst=$((limit*100))
ovs-vsctl set port $v qos=@newqos -- --id=@newqos create qos type=linux-htb queues=0=@q0 other-config:max-rate=$((limit*1000000)) -- --id=@q0 create queue other-config:min-rate=$((limit*1000000)) other-config:max-rate=$((limit*1000000)) &>>/dev/null && echo ‘0‘ || echo ‘1‘
done
#save result to etcd
`which etcdctl` set ${docker_etcd_key}${local_ip}/resource_limit/network_limit/${container} $limit &>>/dev/null
elif [ $op == ‘ulimit‘ ];then
for v in $device_name; do
ovs-vsctl set interface $v ingress_policing_rate=0
ovs-vsctl set interface $v ingress_policing_burst=0
ovs-vsctl clear Port $v qos &>>/dev/null && echo ‘0‘ || echo ‘1‘
done
`which etcdctl` rm ${docker_etcd_key}${local_ip}/resource_limit/network_limit/${container} &>>/dev/null
fi本文出自 “吟—技术交流” 博客，请务必保留此出处http://dl528888.blog.51cto.com/2382721/1659972
标签：docker资源限制 docker cpu限制 docker内存限制
原文地址：http://dl528888.blog.51cto.com/2382721/1659972
