让nginx在CentOS下以chroot的方式运行

实验环境为64位的CentOS6.4，nginx使用官方最新稳定版的，

下载源码包

# wget http://nginx.org/download/nginx-1.6.2.tar.gz

[root@2core local]# tar zxvf nginx-1.6.2.tar.gz

隐藏nginx的真实版本，修改nginx显示版本及名称,

[root@2core nginx-1.6.2]# vi /usr/local/nginx-1.6.2/src/core/nginx.h

#define NGINX_VERSION      "1.6.2"  /*版本号,自己改*/
#define NGINX_VER          "Your string here" /*显示版本时直接显示此字符串*/

增加用户
#groupadd nginx

#useradd -g nginx nginx

[root@2core nginx-1.6.2]# cd /usr/local/nginx-1.6.2

[root@2core nginx-1.6.2]# ./configure --prefix=/usr/local/nginx --user=nginx --group=nginx --with-http_gzip_static_module --http-log-path=/var/log/nginx/access.log

#make

#make install

安装完成，测试是否能正常启动

# /usr/local/nginx/sbin/nginx

[root@2core nginx-1.6.2]# ps auxf|grep nginx //检查nginx是否正常启，也可以http://ip 访问确认，注意iptables也是打开了相关的端口
root 7740 0.0 0.0 103240 852 pts/0 S+ 16:28 0:00 \_ grep nginx
root 7649 0.0 0.0 20212 604 ? Ss 16:26 0:00 nginx: master process /usr/local/nginx/sbin/nginx
nginx 7650 0.0 0.1 20636 1476 ? S 16:26 0:00 \_ nginx: worker process

一切正常，下面开始实施chroot,

1、建立一个chroot运行牢笼(Jail)根目录，比如/nginx

#D=/nginx

#mkdir -p $D

2、建立一个独立的运行环境，nginx将被限制在这环境下运行

mkdir -p $D/etc

mkdir -p $D/dev

mkdir -p $D/var

mkdir -p $D/usr

mkdir -p $D/usr/local/nginx

mkdir -p $D/tmp

chmod 1777 $D/tmp

mkdir -p $D/var/tmp

chmod 1777 $D/var/tmp

mkdir -p $D/lib64

3、还有些特殊设备需要创建，否则可能出错

# ls -l /dev/{null,random,urandom}

[root@2core nginx-1.6.2]# ls -l /dev/{null,random,urandom}
crw-rw-rw-. 1 root root 1, 3 9月 13 2013 /dev/null
crw-rw-rw-. 1 root root 1, 8 9月 13 2013 /dev/random
crw-rw-rw-. 1 root root 1, 9 9月 13 2013 /dev/urandom

#/bin/mknod -m 0666 $D/dev/null c 1 3

#/bin/mknod -m 0666 $D/dev/random c 1 8

#/bin/mknod -m 0444 $D/dev/urandom c 1 9

4、将/urs/local/nginx目录里所有的文件复制到$D/usr/local/nginx目录去

# /bin/cp -farv /usr/local/nginx/* $D/usr/local/nginx

5、因为要启动 $D/usr/local/nginx/sbin/nginx,涉及一些库，相应地，复制相关的库到Jail对应目录去，使用下面的命令查看关联的库

# ldd /usr/local/nginx/sbin/nginx
linux-vdso.so.1 => (0x00007fff225ff000) //这个不用复制
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fb450acf000)
libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007fb450898000)
libpcre.so.0 => /lib64/libpcre.so.0 (0x00007fb45066b000)
libz.so.1 => /lib64/libz.so.1 (0x00007fb450455000)
libc.so.6 => /lib64/libc.so.6 (0x00007fb4500c2000)
/lib64/ld-linux-x86-64.so.2 (0x00007fb450cf5000)
libfreebl3.so => /lib64/libfreebl3.so (0x00007fb44fe5f000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007fb44fc5b000)

6、把上面关联的复制到相应目录里去

[ root@2core nginx-1.6.2]# cp /lib64/libpthread.so.0 /nginx/lib64/
[ root@2core nginx-1.6.2]# cp /lib64/libcrypt.so.1 /nginx/lib64/
[ root@2core nginx-1.6.2]# cp /lib64/libpcre.so.0 /nginx/lib64/
[ root@2core nginx-1.6.2]# cp /lib64/libz.so.1 /nginx/lib64/
[ root@2core nginx-1.6.2]# cp /lib64/libc.so.6 /nginx/lib64/
[ root@2core nginx-1.6.2]# cp /lib64/ld-linux-x86-64.so.2 /nginx/lib64/

cp /lib64/libfreebl3.so /nginx/lib64/

cp /lib64/libdl.so.2 /nginx/lib64/

7、复制/etc 到/nginx目录去，不同系统可能有不同目录，如果下面某目录不存在的话，会有相应的报错，但不会影响

cp -fv /etc/{group,prelink.cache,services,adjtime,shells,gshadow,shadow,hosts.deny,localtime,nsswitch.conf,nscd.conf,prelink.conf,protocols,hosts,passwd,ld.so.cache,ld.so.conf,resolv.conf,host.conf} $D/etc

cp -avr /etc/{ld.so.conf.d,prelink.conf.d} $D/etc

8、启动nginx，

pkill -9 nginx

[ root@2core nginx-1.6.2]# /usr/sbin/chroot /nginx /usr/local/nginx/sbin/nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: [emerg] getpwnam("nginx") failed
nginx: configuration file /usr/local/nginx/conf/nginx.conf test failed

上面的报错是由于还缺少一些库，需要把这些库复制到/nginx/lib64目录下，通过以下命令strace，发现还有库没有复制过来

# strace -f -o /tmp/nginx.strace chroot /nginx /usr/local/nginx/sbin/nginx -t

# more /tmp/nginx.strace

8221 open(" /lib64/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
8221 open("/lib64/tls/x86_64/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
8221 stat("/lib64/tls/x86_64", 0x7fffa8e430a0) = -1 ENOENT (No such file or directory)
8221 open("/lib64/tls/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
8221 stat("/lib64/tls", 0x7fffa8e430a0) = -1 ENOENT (No such file or directory)
8221 open("/lib64/x86_64/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
8221 stat("/lib64/x86_64", 0x7fffa8e430a0) = -1 ENOENT (No such file or directory)
8221 open("/lib64/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
8221 stat("/lib64", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
8221 open("/usr/lib64/tls/x86_64/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
8221 stat("/usr/lib64/tls/x86_64", 0x7fffa8e430a0) = -1 ENOENT (No such file or directory)
8221 open("/usr/lib64/tls/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
8221 stat("/usr/lib64/tls", 0x7fffa8e430a0) = -1 ENOENT (No such file or directory)
8221 open("/usr/lib64/x86_64/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
8221 stat("/usr/lib64/x86_64", 0x7fffa8e430a0) = -1 ENOENT (No such file or directory)
8221 open("/usr/lib64/libnss_files.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
8221 stat("/usr/lib64", 0x7fffa8e430a0) = -1 ENOENT (No such file or directory)
8221 munmap(0x7f6818e0d000, 29430) = 0
8221 write(3, "2014/10/24 17:49:34 [emerg] 8221"..., 99) = 99
8221 write(2, "nginx: [emerg] getpwnam(\"nginx\")"..., 78) = 78
8221 close(4) = 0
8221 write(2, "nginx: configuration file /usr/l"..., 71) = 71
8221 exit_group(1) = ?

[ root@2core nginx-1.6.2]# cp /lib64/libnss_files.so.2 /nginx/lib64/

[ root@2core nginx-1.6.2]# strace -f -o /tmp/nginx.strace chroot /nginx /usr/local/nginx/sbin/nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: [emerg] open() " /var/log/nginx/access.log" failed (2: No such file or directory)
nginx: configuration file /usr/local/nginx/conf/nginx.conf test failed

很明显，这次报错是没有/var/log/nginx/access.log,检查一下，发现没有这个/nginx/var/log目录

[ root@2core nginx-1.6.2]# mkdir -p /nginx/var/log/nginx
[ root@2core nginx-1.6.2]# chmod 777 /nginx/var/log/nginx/
[ root@2core nginx-1.6.2]# strace -f -o /tmp/nginx.strace chroot /nginx /usr/local/nginx/sbin/nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful

测试通过

[ root@2core nginx-1.6.2]# chroot /nginx /usr/local/nginx/sbin/nginx
[ root@2core nginx-1.6.2]# ps auxf|grep nginx
root 8357 0.0 0.0 103240 856 pts/0 S+ 18:04 0:00 \_ grep nginx
root 8354 0.0 0.0 20212 604 ? Ss 18:04 0:00 nginx: master process /usr/local/nginx/sbin/nginx
nginx 8355 0.0 0.1 20636 1200 ? S 18:04 0:00 \_ nginx: worker process

至此，部署完成，这时，nginx 便在/nginx这个目录下运行了，而日志这些文件都在这个目录下生成，注意，这时的配置文件在这/nginx/usr/local/nginx/conf/目录了

# cd /nginx/usr/local/nginx/conf/

# vi nginx.conf

重启命令

# /usr/sbin/chroot /nginx /usr/local/nginx/sbin/nginx -s reload

来源：oschina

链接：https://my.oschina.net/u/1590519/blog/337089

标签

nginx

chroot

网站安全加固