phpor – 第29页 – PHPor 的Blog

ceph -s 与 dashboard

rbd nbd

rbd vs rbd-nbd 两者功能一样，效果也没啥差别，只是实现方式有所不同；前者使用内核的rbd模块访 …

创建新的名字空间

#define _GNU_SOURCE
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <unistd.h>

static char child_stack[1048576];

static int child_fn() {
	printf("PID: %ld\n", (long)getpid());
	sleep(100000);
	return 0;
}

int main(int ac, char** av) {
	int ch;
	int flag = SIGCHLD;
	while((ch = getopt(ac, av, "pmnuU")) != -1) {
		switch(ch) {
			case 'p':
				flag |= CLONE_NEWPID;break;
			case 'm':
				flag |= CLONE_NEWNS;break;
			case 'n':
				flag |= CLONE_NEWNET;break;
			case 'u':
				flag |= CLONE_NEWUTS;break;
			case 'U':
				flag |= CLONE_NEWUSER;break;
		}
	}

	pid_t child_pid = clone(child_fn, child_stack+1048576, flag, NULL);
	printf("clone() = %ld\n", (long)child_pid);

	waitpid(child_pid, NULL, 0);
	return 0;
}

#define _GNU_SOURCE

#include <sched.h>

#include <stdio.h>

#include <stdlib.h>

#include <sys/wait.h>

#include <unistd.h>

static char child_stack[1048576];

static int child_fn() {

printf("PID: %ld\n", (long)getpid());

sleep(100000);

return 0;

}

int main(int ac, char** av) {

int ch;

int flag = SIGCHLD;

while((ch = getopt(ac, av, "pmnuU")) != -1) {

switch(ch) {

case 'p':

flag |= CLONE_NEWPID;break;

case 'm':

flag |= CLONE_NEWNS;break;

case 'n':

flag |= CLONE_NEWNET;break;

case 'u':

flag |= CLONE_NEWUTS;break;

case 'U':

flag |= CLONE_NEWUSER;break;

}

pid_t child_pid = clone(child_fn, child_stack+1048576, flag, NULL);

printf("clone() = %ld\n", (long)child_pid);

waitpid(child_pid, NULL, 0);

return 0;

}

功能：创建新的名字空间，并使得进程处于sl …

继续阅读“创建新的名字空间”

centos7 之vnc黑色桌面

有时候，我们为了安全，禁用root账号登录，需要root的话，在普通账号登录后再sudo；也有时候，我们期望v …

继续阅读“centos7 之vnc黑色桌面”

windows virtio

kvm上安装windows虚拟机时，如果起初配置的磁盘就是virtio驱动的，则安装时会发现不到 …

继续阅读“windows virtio”

kvm 之mem balloon

对于kvm虚拟机，由于宿主机和guest之间的独立性很大，当guest把很多内存用于系统cache的话，宿主机 …

继续阅读“kvm 之mem balloon”

docker 之 exec失败的问题

环境：

# docker info
Containers: 56
 Running: 33
 Paused: 0
 Stopped: 23
Images: 31
Server Version: 1.12.5
Storage Driver: devicemapper
 Pool Name: data-docker_thinpool
 Pool Blocksize: 524.3 kB
 Base Device Size: 32.21 GB
 Backing Filesystem: xfs
 Data file:
 Metadata file:
 Data Space Used: 516.2 GB
 Data Space Total: 644.2 GB
 Data Space Available: 128.1 GB
 Metadata Space Used: 45.47 MB
 Metadata Space Total: 16.98 GB
 Metadata Space Available: 16.93 GB
 Thin Pool Minimum Free Space: 64.42 GB
 Udev Sync Supported: true
 Deferred Removal Enabled: true
 Deferred Deletion Enabled: false
 Deferred Deleted Device Count: 0
 Library Version: 1.02.135-RHEL7 (2016-11-16)
Logging Driver: journald
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: host bridge null overlay
Swarm: inactive
Runtimes: runc docker-runc
Default Runtime: runc
Security Options: seccomp
Kernel Version: 3.10.0-514.6.1.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
Number of Docker Hooks: 2
CPUs: 40
Total Memory: 94.14 GiB
Name: VM-2-10-12
ID: NYBE:NZML:4KQQ:PF2J:RXCB:IPPI:Y3BI:CY7E:RVAC:WVWV:VDM2:3EEK
Docker Root Dir: /data1/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Insecure Registries:
 docker-registry.i.bbtfax.com:5000
 127.0.0.0/8
Registries: docker.io (secure)

# docker info

Containers: 56

Running: 33

Paused: 0

Stopped: 23

Images: 31

Server Version: 1.12.5

Storage Driver: devicemapper

Pool Name: data-docker_thinpool

Pool Blocksize: 524.3 kB

Base Device Size: 32.21 GB

Backing Filesystem: xfs

Data file:

Metadata file:

Data Space Used: 516.2 GB

Data Space Total: 644.2 GB

Data Space Available: 128.1 GB

Metadata Space Used: 45.47 MB

Metadata Space Total: 16.98 GB

Metadata Space Available: 16.93 GB

Thin Pool Minimum Free Space: 64.42 GB

Udev Sync Supported: true

Deferred Removal Enabled: true

Deferred Deletion Enabled: false

Deferred Deleted Device Count: 0

Library Version: 1.02.135-RHEL7 (2016-11-16)

Logging Driver: journald

Cgroup Driver: cgroupfs

Plugins:

Volume: local

Network: host bridge null overlay

Swarm: inactive

Runtimes: runc docker-runc

Default Runtime: runc

Security Options: seccomp

Kernel Version: 3.10.0-514.6.1.el7.x86_64

Operating System: CentOS Linux 7 (Core)

OSType: linux

Architecture: x86_64

Number of Docker Hooks: 2

CPUs: 40

Total Memory: 94.14 GiB

Name: VM-2-10-12

ID: NYBE:NZML:4KQQ:PF2J:RXCB:IPPI:Y3BI:CY7E:RVAC:WVWV:VDM2:3EEK

Docker Root Dir: /data1/docker

Debug Mode (client): false

Debug Mode (server): false

Registry: https://index.docker.io/v1/

Insecure Registries:

docker-registry.i.bbtfax.com:5000

127.0.0.0/8

Registries: docker.io (secure)

现象： [crayon …

继续阅读“docker 之 exec失败的问题”

windows 内存计算

不严格地讲，内存各部分关系大致如下：可用（60287） + 已用（37G） = 总数（96G）已缓存（4 …

继续阅读“windows 内存计算”

libudev on centos7

只需要安装 systemd-devel 就行了

vnc in openstack

在openstack管理的虚拟机中启动vnc时，:1 是启动不了的，似乎是被kvm已某种方式给占用了，而这种占 …

继续阅读“vnc in openstack”