pid

PID mapping between docker and host

ε祈祈猫儿з 提交于 2019-12-04 22:04:08
问题 How docker namespace is different from Host namespace and how the pid can be mapped between these two? Can anyone give me an idea that helps to make easy way of mapping pid's between host n docker using source code? 回答1: You can find the mapping in /proc/PID/status file. It contains a line like: NSpid: 16950 24 Which means that 16950 on the host is 24 inside the container. 回答2: As I mentioned in "Running docker securely": Currently, Docker uses five namespaces to alter processes view of the

Password Management for non-interactive process

三世轮回 提交于 2019-12-04 19:18:55
The challenge I need a password management tool that will be invoked by other processes (scripts of all sort: python, php, perl, etc) and it will be able to identify and verify the caller script in order to perform access control: either return a password back or exit -1 The current implementation After looking into various frameworks, I have decided to use python 's keepassdb which is able to handle Keepass V1.X backend database files and build my own access control overlay (since this can later be customized and integrated to our LDAP for user/group access). Access control is done via

tomcat shutdown后,进程还存在的解决办法

最后都变了- 提交于 2019-12-04 18:40:08
基本原理为启动tomcat时记录启动tomcat的进程id(pid),关闭时强制杀死该进程 第一步 :vim修改tomcat下bin/catalina.sh文件,添加点东西,主要是记录tomcat的pid,如下: #设置记录CATALINA_PID。 #该设置会在启动时候bin下新建一个CATALINA_PID文件 #关闭时候从CATALINA_PID文件找到pid,kill。。。同时删除CATALINA_PID文件 在PRGDIR=`dirname "$PRG"`后面加上: if [ -z "$CATALINA_PID" ]; then CATALINA_PID=$PRGDIR/CATALINA_PID fi 第二步 vim tomcat的shutdown.sh文件,在最后一行加上-force: bin/shutdown.sh exec "$PRGDIR"/"$EXECUTABLE" stop -force "$@" #加上 -force 来源: oschina 链接: https://my.oschina.net/u/2897227/blog/1608132

Get only PID from tasklist using cmd title

白昼怎懂夜的黑 提交于 2019-12-04 17:47:33
Desired output: 1234 Just the PID. Nothing else - no other characters, numbers, or symbols. I'm trying to run tasklist so it gives me only the PID of a named or titled process. tasklist | findstr /i "cmd.exe" is the closest I've gotten, but the result is too verbose. I just want the PID number. Bonus points for linking me a description of what the tasklist filter operators mean - "eq", "ne", etc, since they aren't anywhere in the documentation . The difficult thing with tasklist is its default output format. For example, when command line: tasklist /FI "ImageName eq cmd.exe" /FI "Status eq

Inside a bash script, how to get PID from a program executed when using the eval command?

不想你离开。 提交于 2019-12-04 16:52:49
问题 I have commands in a bash script that are similar to this: eval "( java -classpath ./ $classname ${arguments[@]} $redirection_options $file )" & pid=$! However if I do a ps $pid it shows the main script process instead of the process of the java program. It obtains the correct process when I omit the eval, but in order to get some of the complicated arguments to work correctly I need to use it. Any idea of how I can get the PID of the java program when it's executed within an eval command?

Linu创建回收进程fork、exec、wait、waitpid函数的理解

北城以北 提交于 2019-12-04 16:26:31
1. fork    int pid = fork();   if (pid == -1 ) {//返回-1,说明fork失败     perror("fork");     exit(1);   } else if (pid > 0) {//返回子进程pid,说明是父进程   } else if (pid == 0) {//返回0,说明是子进程   }   fork出来的子进程和父进程相同的是:全局变量、.data、.text、堆、栈、环境变量、工作目录、宿主目录、信号处理方式等   不同的是:进程id,父进程id,定时器,未决信号集   1-1)父子进程共享文件描述符:     int test_share_fd() {       int fd = open("test_share_fd.txt", O_CREAT | O_RDWR, 0777);//在fork之前open的文件,共享fd以及文件指针offset       if (fd == -1)       {         perror("open file error");         exit(EXIT_FAILURE);       }       int pid = fork();//在fork之后open的文件,共享fd,但不共享文件指针offset       if (pid == -1)     

如何优雅地防止MLE(for linux)

旧城冷巷雨未停 提交于 2019-12-04 14:01:52
赛前最后一天模拟赛又有小伙伴MLE了……这里就讲一下如何较为精确地获取程序运行时间和空间。 资源统计当然是操作系统统计的最精确。所以可以这样写(noilinux实测通过,windows下应该不行): 注意 :程序所占空间为当下运行最大所占的空间。这样统计包括动态空间,但不代表可能的最大所占空间。申请的数组如果没有用完也不会统计进去。(这也是大部分OJ没有用很多动态内存,而各个测试点所占内存仍有较大差距的原因。)所以你需要极限数据来帮你。当然,还是 手算的上限最靠谱 。 #include <cstdio> #include <stdlib.h> #include <unistd.h> #include <sys/wait.h> #include <sys/resource.h> int main() { pid_t Pid; Pid = fork(); if (Pid == -1) { printf("Fork error.\n"); //错误信息。没有遇到过,应该省去问题不大。 return 0; } if (Pid == 0) { system("./a.out < in > out");//这里放你想执行的命令。 return 0; } int State = 0; rusage RUse; pid_t PID = wait4(-1, &State, __WALL, &RUse

php+mysql 实现无限极分类

隐身守侯 提交于 2019-12-04 10:53:04
php+mysql 实现无限极分类 <pre> id name pid path 1 电脑 0 0 2 手机 0 0 3 笔记本 1 0-1 4 超级本 3 0-1-3 5 游戏本 3 0-1-3 </pre> 这种方式,假设我们要查询电脑下的所有后代分类,只需要一条sql语句: <pre> select id,name from category where path like ( select concat(path,'-',id,'%') path from category where id=1 ); </pre> 优点:查询容易,效率高,path字段可以加索引。 缺点:更新节点关系麻烦,需要更新所有后辈的path字段。 方案一的样例代码: <pre> <?php $addrs = array( array('id'=>1, 'name'=>'中国', 'pid'=>0), array('id'=>2, 'name'=>'河南', 'pid'=>1), array('id'=>3, 'name'=>'郑州', 'pid'=>2), array('id'=>4, 'name'=>'洛阳', 'pid'=>2), array('id'=>5, 'name'=>'安阳', 'pid'=>2), array('id'=>6, 'name'=>'林州', 'pid'=>5),

waitpid()

二次信任 提交于 2019-12-04 10:42:10
waitpid() pid_t waitpid(pid_t pid, int *status, int options); 参数: pid>0 只等待进程 ID 等于 pid 的子进程,不管其它已经有多少子进程运行结束退出了,只要指定的子进程还没有结束, waitpid 就会一直等下去。 来源: https://www.cnblogs.com/hshy/p/11855931.html

nginx.conf and nginx.pid users and permissions

我们两清 提交于 2019-12-04 09:21:48
I'm embarking on watching my NGINX error.log files at level: warn... probably a silly idea and will cause me to crash my server as I work out any bugs happening, but hey, we're nerds and this is why we're here. I'm noticing a [warn] and an [emerg] pop up every time I restart my server, which shows: [warn] 8041#0: the "user" directive makes sense only if the master process runs with super-user privileges, ignored in /etc/nginx/nginx.conf:1 [emerg] 8041#0: open() "/run/nginx.pid" failed (13: Permission denied) The top of my nginx.conf file reads: user www-data; worker_processes auto; pid /run