将host目录挂载到docker container里后，运行cyclictest发现没有库文件
[root@31ac104a9281redapple]# cyclictest -c CLOCK
bash:cyclictest: command not found //说明挂载过来的cyclictest并不在当前目录下
[root@31ac104a9281 redapple]# which cyclictest
bash: which: command not found
[root@31ac104a9281 redapple]# pwd
/opt/redapple
[root@31ac104a9281 redapple]# echo $PATH //查看cyclictest存在哪个目录
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
[root@31ac104a9281redapple]# ./cyclictest -c CLOCK //可以使用 ./cyclictest方式或者将cycilctest添加到 $PATH 目录下
./cyclictest:error while loading shared libraries: libnuma.so.1: cannot open shared objectfile: No such file or directory
[root@31ac104a9281redapple]# ld
ld ld.bfd ld.gold ldattach ldconfig ldd
[root@31ac104a9281 redapple]# ldd ./cyclictest //ldd的作用是打印可执行档依赖的共享库文件
linux-vdso.so.1 => (0x00007ffc7137c000)
librt.so.1=> /lib64/librt.so.1 (0x00007f071f0e1000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f071eec5000)
libnuma.so.1 => not found
libc.so.6=> /lib64/libc.so.6 (0x00007f071eb03000)
/lib64/ld-linux-x86-64.so.2 (0x00007f071f2e9000)
查询到host上的cyclictest库文件并没有挂载到dockercontainer中，需要在host上与docker共享的目录下新建文件夹LIB，将库文件拷贝到LIB下，然后在dockercontainer中添加相应环境变量LIB_LIBRARY_PATH,然后container就能引用其库文件。
[root@localhost rt-tests-1.0]# mkdir LIB
[root@localhost rt-tests-1.0]# cd LIB/
[root@localhost LIB]# cd ..
[root@localhost rt-tests-1.0]# ldd /usr/bin/cyclictest
linux-vdso.so.1 => (0x00007ffe10d48000)
librt.so.1=> /lib64/librt.so.1 (0x00007f15fba0a000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f15fb7ee000)
libnuma.so.1=> /lib64/libnuma.so.1(0x00007f15fb5e2000)
libc.so.6=> /lib64/libc.so.6 (0x00007f15fb220000)
/lib64/ld-linux-x86-64.so.2 (0x00007f15fbc12000)
libgcc_s.so.1=> /lib64/libgcc_s.so.1 (0x00007f15fb00a000)
[root@localhostrt-tests-1.0]# cd LIB/
[root@localhost LIB]#pwd
/root/daisy/RT_test/rt-tests-1.0/LIB
[root@localhost LIB]#cp /lib64/libnuma.so.1 . //将库文件拷贝到当前目录下
开始添加环境变量
[root@31ac104a9281 redapple]# ls
COPYING bld linux-3.12.66.tar.gz rt-migrate-test
LIB cyclictest patch-3.12.66-rt88.patch.gz sendme
MAINTAINERS hackbench pi_stress signaltest
Makefile hwlatdetect pip_stress sigwaittest
README.markdown libnuma.so.1 pmqtest src
RT_test linux-3.12.66 ptsematest svsematest
[root@31ac104a9281 redapple]# echo $LD_LIBRARY_PATH
[root@31ac104a9281redapple]# pwd
/opt/redapple
[root@31ac104a9281 redapple]# export LD_LIBRARY_PATH=/opt/redapple/LIB//每次退出container再进去都需要export环境变量
[root@31ac104a9281 redapple]# cd LIB
[root@31ac104a9281 LIB]# ls
libnuma.so.1
[root@31ac104a9281 redapple]# ldd ./cyclictest
linux-vdso.so.1 => (0x00007ffefa557000)
librt.so.1=> /lib64/librt.so.1 (0x00007fae59382000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fae59166000)
libnuma.so.1 =>/opt/redapple/LIB/libnuma.so.1 (0x00007fae58f5a000)
libc.so.6=> /lib64/libc.so.6 (0x00007fae58b98000)
/lib64/ld-linux-x86-64.so.2 (0x00007fae5958a000)
libgcc_s.so.1=> /lib64/libgcc_s.so.1 (0x00007fae58982000)
[root@31ac104a9281 redapple]#./cyclictest -c CLOCK
Unable to change scheduling policy!
either run as root or join realtime group
安装完cyclictest在host上也会出现这个问题，打完patch就ok了，现在在docker上也出现这个问题需要解决。
解决方法为在创建container时就添加参数--cap-add=sys_nice
[root@localhost daisy_docker]# dockerrun -it -d -P --cap-add=sys_nice --nameweb3 -v /root/daisy/RT_test/rt-tests-1.0:/opt/goodred centos
创建容器名为web3，host目录/root/daisy/RT_test/rt-tests-1.0挂载到docker container目录/opt/goodred下，image为centos
[root@43640390f92bgoodred]# export LD_LIBRARY_PATH=/opt/goodred/LIB
[root@43640390f92b goodred]# ./cyclictest -t1 -p 99 -n -i 1000 -l 1800000
WARN: stat/dev/cpu_dma_latency failed: No such file or directory
policy: fifo:loadavg: 0.13 0.07 0.05 1/1775 20
T: 0 ( 20) P:99 I:1000 C: 404874 Min: 3 Act: 60 Avg: 54 Max: 115