一. 命令行获取
通过调用shell命令获取系统信息，如cpu个数，cpu/内存磁盘使用情况，网络信息等。
获取IP地址：ifconfig ens33 | awk '/inet addr/{ print $2; }' | cut -d : -f 2 CPU一分钟平均使用率： cat /proc/loadavg | cut -d ' ' -f 1 CPU当前使用率：IDLE=$(top -b -n 1|grep Cpu|awk '{print $8; }' ) (100-IDLE)% CPU当前用户使用率：top -b -n 1|grep Cpu|awk '{print $2; }' 总内存：cat /proc/meminfo | awk '/MemTotal/{print $2}' 空闲内存：cat /proc/meminfo | awk '/MemFree/{print $2}' 磁盘占用率：df -h | grep '/dev/root' | awk '{print $5}' 当前时间：date +%Y%m%d-%H:%M:%S 系统运行时间：uptime | awk '{ print $3; }' | cut -d ',' -f1
#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #define CMD_BUF_SIZE 256 typedef float (*func_trans)(char *buf, int buf_size); static float trans_cpu_avg_rate(char *buf, int buf_size); static float trans_cpu_now_rate(char *buf, int buf_size); static float trans_mem_rate(char *buf, int buf_size); static int exec_cmd(char *buf, int buf_size, char *cmd) { if(NULL == cmd || NULL == buf || buf_size <= 0){ return -1; } FILE *f = NULL; int len = 0; f= popen(cmd, "r"); if(NULL == f){ return -1; } // memset(buf, ' ', buf_size); if(NULL == fgets(buf, buf_size, f)){ pclose(f); return -1; } pclose(f); len = strlen(buf); if(len > 0 && (buf[len-1] == ' ')){ buf[len-1] = ' '; len --; } return len; } struct st_cmd_gw{ char *item; char format; char *cmd; func_trans trans; char *factor; } cmd_gw[] = { {"ip1", 's', "ifconfig eth0 | awk '/inet /{ print $2; }' | cut -d : -f 2", NULL, NULL}, {"wlp1s0", 's', "ifconfig wlp1s0 | awk '/inet /{ print $2; }' | cut -d : -f 2", NULL, NULL}, {"pppoe", 's', "ifconfig ppp0 | awk '/inet /{ print $2; }' | cut -d : -f 2", NULL, NULL}, {"time_now", 's', "date '+%Y-%m-\%d %H:%M:\%S'", NULL, NULL}, {"time_up", 's', "uptime | awk '{ print $3; }' | cut -d ',' -f1", NULL, NULL}, {"cpu_avg_rate", 'f', "cat /proc/loadavg | cut -d ' ' -f 1", trans_cpu_avg_rate, "100*\%f/4"}, {"cpu_now_rate", 'f', "top -b -n 1|grep Cpu|awk '{print $8; }' ", trans_cpu_now_rate, "100.00-\%f"}, {"cpu_usr_now_rate", 'f', "top -b -n 1|grep Cpu|awk '{print $2; }'", NULL, NULL}, {"disk_rate", 'f', "df -h | grep '/dev/root' | awk '{print $5}'", NULL, NULL}, {"disk_use_f", 'f', "df -h | grep '/dev/root' | awk '{print $3}'", NULL, NULL}, {"disk_avail_f", 'f', "df -h | grep '/dev/root' | awk '{print $4}'", NULL, NULL}, {"disk_use_s", 's', "df -h | grep '/dev/root' | awk '{print $3}'", NULL, NULL}, {"disk_avail_s", 's', "df -h | grep '/dev/root' | awk '{print $4}'", NULL, NULL}, {"ram_rate", 'f', "cat /proc/meminfo | awk '/MemTotal/{print $2}'", trans_mem_rate, NULL}, {"ram_all", 'f', "cat /proc/meminfo | awk '/MemTotal/{print $2}'", NULL, NULL}, {"ram_free", 'f', "cat /proc/meminfo | awk '/MemFree/{print $2}'", NULL, NULL}, {"cpu_num", 's', "cat /proc/cpuinfo | grep "processor" | wc -l | awk '{print $1}'", NULL, NULL} }; // out: output the result of the string type // f: output the result of the float type int out_gw(char *out, int out_len, const char *in, float *f) { if(NULL == in || NULL == out || out_len <= 0){ return -1; } int i = 0; int len = strlen(in); int count = sizeof(cmd_gw)/sizeof(cmd_gw[0]); for(; i < count; i++){ if(!strncasecmp(in, cmd_gw[i].item, len)){ break; } } if(i >count){ return -1; } int ret = exec_cmd(out, out_len, cmd_gw[i].cmd); if(ret <= 0){ return -1; } *f = 0.0; if('f' == cmd_gw[i].format){ if(cmd_gw[i].trans){ *f = (cmd_gw[i].trans)(out, out_len); } else { *f = atof(out); } } return cmd_gw[i].format; } static float trans_cpu_avg_rate(char *buf, int buf_size) { return 100 * atof(buf) / 4; } static float trans_cpu_now_rate(char *buf, int buf_size) { return 100.00 - atof(buf); } static float trans_mem_rate(char *buf, int buf_size) { float f = 0.0; char out_free[CMD_BUF_SIZE] = {' '}; int ret_free = out_gw(out_free, sizeof(out_free), "mem_free", &f); if('f' != (char)ret_free){ return -1; } return 100.00 - 100.00 * atof(out_free) / atof(buf); }
容器信息也可通过docker stats获取到：
docker stats --no-stream --format "{"container":"{{ .Name }}","memory":{"raw":"{{ .MemUsage }}","percent":"{{ .MemPerc }}"},"cpu":"{{ .CPUPerc }}","networkIO":"{{.NetIO}},"BlockIO":"{{.BlockIO}}"}" {"container":"cadvisor","memory":{"raw":"40.45MiB / 3.701GiB","percent":"1.07%"},"cpu":"2.40%","networkIO":"11.9MB / 1.27GB,"BlockIO":"0B / 0B"} {"container":"orderer.example.com","memory":{"raw":"21.18MiB / 3.701GiB","percent":"0.56%"},"cpu":"0.29%","networkIO":"57.7MB / 57.9MB,"BlockIO":"0B / 0B"} {"container":"orderer4.example.com","memory":{"raw":"18.62MiB / 3.701GiB","percent":"0.49%"},"cpu":"0.28%","networkIO":"57.5MB / 57.4MB,"BlockIO":"0B / 0B"} {"container":"orderer2.example.com","memory":{"raw":"18.6MiB / 3.701GiB","percent":"0.49%"},"cpu":"0.32%","networkIO":"57.5MB / 57.4MB,"BlockIO":"0B / 0B"} {"container":"orderer5.example.com","memory":{"raw":"18.2MiB / 3.701GiB","percent":"0.48%"},"cpu":"0.35%","networkIO":"57.4MB / 57.3MB,"BlockIO":"0B / 0B"} {"container":"orderer3.example.com","memory":{"raw":"25.19MiB / 3.701GiB","percent":"0.66%"},"cpu":"0.63%","networkIO":"228MB / 229MB,"BlockIO":"0B / 0B"}
当然docker信息可通过dockerAPI或SDK获取，参考：Develop with Docker Engine SDKs and API https://docs.docker.com/engine/api/v1.39/#
二. cadvisor
参考：
1. linux内存查看及释放