内容简介：
实现一个基于d3.js v4.*版本的力导向图。大致分为几个步骤：
1 获取适合force图表的数据。
2 转换数据为force能识别的结构。
3 在页面中添加svg标签和一些初始化参数。
4 绘制force 节点。
5 绘制节点之前的连线。
6 在节点上显示对应的说明。
7 在节点上添加事件(这里可能只介绍鼠标经过和双击事件)。
(以下功能请看笔记二 )
8 在连线上显示箭头方向和对应的说明。
9 替换节点为某种图标。
10 使图标不能拖出显示窗外。
11 使节点不能重叠。
12 实现动态修改数据使其图表发生变化。
13 使其图表可以自适应。
14 缩放force。
** 关于d3.js v4的API说明请查看此链接 **
1 获取数据
数据可以有很多种手段获取，比如ajax或者websokect或者直接读取某个json文件或者当前上下文里面定义的数据或者直接使用d3.request等函数实现等等。这里为了方便测试就直接在上下文重定义个写死的数据，这个数据是json格式的有点多所以放在了最后附录里面。
2 转换数据为force能识别的结构
转换数据为力导向图数据一般使用d3.forceSimulation如下代码：
.force("link", d3.forceLink().id(function(d){
/***
指定连线的连接所使用的标示是哪一个字段。
***/
return d.node_node_id;
}))
/***
设置force的装载方式，这里还很模糊他的作用后面再讲解
***/
.force("charge", d3.forceManyBody())
/***
设置force图表的中心点，一般设置为svg宽高的中心点
宽高的定义可以为全局变量，这里没有写出他们的定义，如需测试需要自己定义。
***/
.force("center", d3.forceCenter(width_2 / 2, height_2 / 2))
/***
设置force的节点数据
***/
.nodes(graph.nodes);
通过这种方法转换后就会在原来定义的数据结构里面多出一些关于节点坐标和连线的原始坐标和目标坐标等字段，可以通过console.log(graph)的方式在浏览器控制台查看转换后的不同。
3 在页面中添加svg标签和一些初始化参数
var svg_4 = d3.select("#host_service_state")
.append("svg")
.attr("width", width_2)
.attr("height", height_2);
//这里使用d3的选择器来选择一个id为host_service_state的div并在里面添加一个svg标签
//并设置这个svg的宽度和高度。为实现自适应后面还会对这点进行修改。
4 绘制force 节点
//这里节点都是圆形展示的，所以通过d3在svg标签中添加了一个g(group)对所有circle(圆形)标签
//进行一个分组然后在里面根据nodes的个数添加多个circle，并设置每个圆的半径为20像素。
//填充的颜色为使用schemeCategory20生成的一个颜色组合，这里根据节点的下标分别选择不同的颜色，后面会替换为图标。
//再使用d3的call()函数使其在每个节点创建完后调用d3.drag()相关拖拽的事件监听，这分别对拖拽开始，拖拽中，拖拽结束做了监听。
var color_4 = d3.scaleOrdinal(d3.schemeCategory20);
var svg_nodes = svg_4.append("g").selectAll("circle")
.data(graph.nodes)
.enter()
.append("circle")
.attr("r",5) #
.style("fill",function(d,i){
return color_4(i);
})
.call(d3.drag().on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
//拖拽开始绑定的回调函数参数为node节点，首先判断事件是否活动并设置动画的a曲线值。
//这个值是设置动画效果的，然后重新渲染。
//这里fx为当前节点的固定坐标，x为节点的原始坐标。
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
//拖拽中的回调函数，参数还是为node节点，这里不断的更新节点的固定坐标根据鼠标事件的坐标
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
//拖拽结束回调函数，参数也是node节点，判断事件状态动画系数设置为0结束动画，并设置固定坐标都为null。
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
//对于这几个事件还有点模糊，只有通过调试来看这些事件的作用。
5 绘制节点之前的连线
//这里在svg的标签中又添加了一个g标签来分组所有连线并通过links来画出所有的线并设置线的颜色为"#ccc"和线宽为1像素。
var svg_edges = svg_4.append("g").selectAll("line")
.data(graph.links)
.enter()
.append("line")
.style("stroke","#ccc")
.style("stroke-width",1);
6 在节点上显示对应的说明。
//添加描述节点的文字,以每个节点的圆心为原点像右移动20像素并向下移动8像素添加一个text标签并设置显示内容
var svg_texts = svg_4.selectAll("text")
.data(graph.nodes)
.enter()
.append("text")
.style("fill", "black")
.attr("dx", 20)
.attr("dy", 8)
.text(function(d){
if(d.node_node_type == "INSTANCE"){
return d.node_ins_name;
}else{
return d.node_display_name;
}
});
7 在节点上添加事件(这里可能只介绍鼠标经过和双击事件)
.on("dblclick", function(d,i){
alert("dblclick");
})
.on("mouseover", function(d,i){
alert("mouseover");
})
//在绘制节点svg_nodes的call前面添加以上代码即可
用谷歌浏览器打开你所写好的html文件得到以下图示:
Paste_Image.png
由于简书字数限制剩余部分将在笔记二中继续完成。
附录：
json:
var graph =
{
"nodes": [{
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809563000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 1,
"node_group_alias": "Linux Servers",
"node_output": "PING OK - Packet loss = 0%, RTA = 0.21 ms",
"node_display_name": "cloud001",
"node_type": "hosts",
"node_host_address": "172.31.254.1",
"node_last_state_change": 1482392477000,
"node_group_obj_id": 206,
"node_alias": "cloud001",
"node_status_update_time": 1482809563000,
"node_next_check": 1482809620000,
"node_node_type": "HOST",
"node_pk_id": 4,
"node_current_state": 0,
"node_node_id": "247",
"node_obj_id": 247,
"node_parent_obj_id": 264
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809563000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 1,
"node_group_alias": "Linux Servers",
"node_output": "PING OK - Packet loss = 0%, RTA = 0.21 ms",
"node_display_name": "cloud001",
"node_type": "hosts",
"node_host_address": "172.31.254.1",
"node_last_state_change": 1482392477000,
"node_group_obj_id": 206,
"node_alias": "cloud001",
"node_status_update_time": 1482809563000,
"node_next_check": 1482809620000,
"node_node_type": "INSTANCE",
"node_pk_id": 4,
"node_current_state": 0,
"node_node_id": "1default",
"node_obj_id": 247,
"node_parent_obj_id": 264
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809563000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 1,
"node_group_alias": "Linux Servers",
"node_output": "PING OK - Packet loss = 0%, RTA = 0.21 ms",
"node_display_name": "cloud001",
"node_type": "hosts",
"node_host_address": "172.31.254.1",
"node_last_state_change": 1482392477000,
"node_group_obj_id": 206,
"node_alias": "cloud001",
"node_status_update_time": 1482809563000,
"node_next_check": 1482809620000,
"node_node_type": "GROUP",
"node_pk_id": 4,
"node_current_state": 0,
"node_node_id": "206",
"node_obj_id": 247,
"node_parent_obj_id": 264
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809563000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 1,
"node_group_alias": "Linux Servers",
"node_output": "PING OK - Packet loss = 0%, RTA = 0.21 ms",
"node_display_name": "cloud002",
"node_type": "hosts",
"node_host_address": "172.31.254.2",
"node_last_state_change": 1482392477000,
"node_group_obj_id": 206,
"node_alias": "cloud002",
"node_status_update_time": 1482809563000,
"node_next_check": 1482809620000,
"node_node_type": "HOST",
"node_pk_id": 3,
"node_current_state": 0,
"node_node_id": "246",
"node_obj_id": 246,
"node_parent_obj_id": 264
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809563000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 1,
"node_group_alias": "Linux Servers",
"node_output": "PING OK - Packet loss = 0%, RTA = 0.18 ms",
"node_display_name": "cloud003",
"node_type": "hosts",
"node_host_address": "172.31.254.3",
"node_last_state_change": 1482392477000,
"node_group_obj_id": 206,
"node_alias": "cloud003",
"node_status_update_time": 1482809563000,
"node_next_check": 1482809620000,
"node_node_type": "HOST",
"node_pk_id": 6,
"node_current_state": 0,
"node_node_id": "249",
"node_obj_id": 249,
"node_parent_obj_id": 264
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809578000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 1,
"node_group_alias": "Linux Servers",
"node_output": "PING OK - Packet loss = 0%, RTA = 0.31 ms",
"node_display_name": "cloud004",
"node_type": "hosts",
"node_host_address": "172.31.254.4",
"node_last_state_change": 1482392477000,
"node_group_obj_id": 206,
"node_alias": "cloud004",
"node_status_update_time": 1482809578000,
"node_next_check": 1482809637000,
"node_node_type": "HOST",
"node_pk_id": 5,
"node_current_state": 0,
"node_node_id": "248",
"node_obj_id": 248,
"node_parent_obj_id": 264
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809578000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 1,
"node_group_alias": "Linux Servers",
"node_output": "PING OK - Packet loss = 0%, RTA = 0.26 ms",
"node_display_name": "cloud005",
"node_type": "hosts",
"node_host_address": "172.31.254.5",
"node_last_state_change": 1482737912000,
"node_group_obj_id": 206,
"node_alias": "cloud005",
"node_status_update_time": 1482809578000,
"node_next_check": 1482809637000,
"node_node_type": "HOST",
"node_pk_id": 7,
"node_current_state": 0,
"node_node_id": "250",
"node_obj_id": 250,
"node_parent_obj_id": 264
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809578000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 1,
"node_group_alias": "Linux Servers",
"node_output": "PING OK - Packet loss = 0%, RTA = 0.27 ms",
"node_display_name": "cloud006",
"node_type": "hosts",
"node_host_address": "172.31.254.6",
"node_last_state_change": 1482737912000,
"node_group_obj_id": 206,
"node_alias": "cloud006",
"node_status_update_time": 1482809578000,
"node_next_check": 1482809637000,
"node_node_type": "HOST",
"node_pk_id": 8,
"node_current_state": 0,
"node_node_id": "251",
"node_obj_id": 251,
"node_parent_obj_id": 264
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809578000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 1,
"node_group_alias": "Linux Servers",
"node_output": "PING OK - Packet loss = 0%, RTA = 0.03 ms",
"node_display_name": "monitor01.cqccs.com",
"node_type": "hosts",
"node_host_address": "127.0.0.1",
"node_last_state_change": 1482737912000,
"node_group_obj_id": 206,
"node_alias": "monitor01.cqccs.com",
"node_status_update_time": 1482809578000,
"node_next_check": 1482809637000,
"node_node_type": "HOST",
"node_pk_id": 2,
"node_current_state": 0,
"node_node_id": "232",
"node_obj_id": 232,
"node_parent_obj_id": 264
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809563000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 1,
"node_group_alias": "Linux Servers",
"node_output": "PING OK - Packet loss = 0%, RTA = 0.35 ms",
"node_display_name": "Ser-ldapDNS",
"node_type": "hosts",
"node_host_address": "192.168.10.200",
"node_last_state_change": 1482809137000,
"node_group_obj_id": 206,
"node_alias": "Ser-ldapDNS",
"node_status_update_time": 1482809563000,
"node_next_check": 1482809620000,
"node_node_type": "HOST",
"node_pk_id": 10,
"node_current_state": 0,
"node_node_id": "280",
"node_obj_id": 280,
"node_parent_obj_id": 264
}, {
"node_display_name": "storage",
"node_type": "hosts",
"node_ins_name": "default",
"node_ins_id": 1,
"node_is_active": 0,
"node_node_type": "HOST",
"node_node_id": "205",
"node_obj_id": 205
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809574000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 1,
"node_output": "PING OK - Packet loss = 0%, RTA = 0.61 ms",
"node_display_name": "sw-ruijie1",
"node_type": "hosts",
"node_host_address": "172.31.254.252",
"node_dependent_obj_id": 232,
"node_last_state_change": 1482737912000,
"node_alias": "sw-ruijie1",
"node_status_update_time": 1482809574000,
"node_next_check": 1482809631000,
"node_node_type": "HOST",
"node_pk_id": 9,
"node_current_state": 0,
"node_node_id": "264",
"node_obj_id": 264
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482740833000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 0,
"node_output": "Icinga 2 has been running for 26 minutes and 1 second. Version: r2.6.0-1",
"node_display_name": "icinga",
"node_type": "services",
"node_host_address": "172.31.254.1",
"node_last_state_change": 1482737936000,
"node_status_update_time": 1482740833000,
"node_next_check": 1482740893000,
"node_node_type": "SERVICE",
"node_run_on": 247,
"node_pk_id": 39,
"node_current_state": 0,
"node_node_id": "266",
"node_obj_id": 266
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482740871000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 0,
"node_output": "OK - load average: 0.00, 0.05, 0.11",
"node_display_name": "load",
"node_type": "services",
"node_host_address": "172.31.254.1",
"node_last_state_change": 1482739329000,
"node_status_update_time": 1482740871000,
"node_next_check": 1482740931000,
"node_node_type": "SERVICE",
"node_run_on": 247,
"node_pk_id": 49,
"node_current_state": 0,
"node_node_id": "276",
"node_obj_id": 276
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809574000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 1,
"node_group_alias": "Ping Checks",
"node_output": "PING OK - Packet loss = 0%, RTA = 0.18 ms",
"node_display_name": "ping4",
"node_type": "services",
"node_host_address": "172.31.254.1",
"node_last_state_change": 1482238548000,
"node_group_obj_id": 224,
"node_status_update_time": 1482809574000,
"node_next_check": 1482809631000,
"node_node_type": "SERVICE",
"node_run_on": 247,
"node_pk_id": 26,
"node_current_state": 0,
"node_node_id": "252",
"node_obj_id": 252
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809574000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 1,
"node_group_alias": "Ping Checks",
"node_output": "PING OK - Packet loss = 0%, RTA = 0.18 ms",
"node_display_name": "ping4",
"node_type": "services",
"node_host_address": "172.31.254.1",
"node_last_state_change": 1482238548000,
"node_group_obj_id": 224,
"node_status_update_time": 1482809574000,
"node_next_check": 1482809631000,
"node_node_type": "GROUP",
"node_run_on": 247,
"node_pk_id": 26,
"node_current_state": 0,
"node_node_id": "224",
"node_obj_id": 252
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809553000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 1,
"node_output": "SSH OK - OpenSSH_6.7p1 Debian-5+deb8u3 (protocol 2.0) ",
"node_display_name": "ssh",
"node_type": "services",
"node_host_address": "172.31.254.1",
"node_last_state_change": 1482242525000,
"node_status_update_time": 1482809553000,
"node_next_check": 1482809612000,
"node_node_type": "SERVICE",
"node_run_on": 247,
"node_pk_id": 35,
"node_current_state": 0,
"node_node_id": "261",
"node_obj_id": 261
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482740833000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 0,
"node_output": "Icinga 2 has been running for 26 minutes and 1 second. Version: r2.6.0-1",
"node_display_name": "icinga",
"node_type": "services",
"node_host_address": "172.31.254.2",
"node_last_state_change": 1482737937000,
"node_status_update_time": 1482740833000,
"node_next_check": 1482740893000,
"node_node_type": "SERVICE",
"node_run_on": 246,
"node_pk_id": 40,
"node_current_state": 0,
"node_node_id": "267",
"node_obj_id": 267
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482740871000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 0,
"node_output": "OK - load average: 0.00, 0.05, 0.11",
"node_display_name": "load",
"node_type": "services",
"node_host_address": "172.31.254.2",
"node_last_state_change": 1482739329000,
"node_status_update_time": 1482740871000,
"node_next_check": 1482740931000,
"node_node_type": "SERVICE",
"node_run_on": 246,
"node_pk_id": 48,
"node_current_state": 0,
"node_node_id": "275",
"node_obj_id": 275
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809574000,
"node_ins_id": 1,
"node_retry_check_interval": 0.5,
"node_is_active": 1,
"node_group_alias": "Ping Checks",
"node_output": "PING OK - Packet loss = 0%, RTA = 0.19 ms",
"node_display_name": "ping4",
"node_type": "services",
"node_host_address": "172.31.254.2",
"node_last_state_change": 1482238548000,
"node_group_obj_id": 224,
"node_status_update_time": 1482809574000,
"node_next_check": 1482809631000,
"node_node_type": "SERVICE",
"node_run_on": 246,
"node_pk_id": 28,
"node_current_state": 0,
"node_node_id": "254",
"node_obj_id": 254
}, {
"node_normal_check_interval": 1.0,
"node_ins_name": "default",
"node_last_check": 1482809553000,
"node_ins_id": 1,
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"node_display_name": "ssh",
"node_type": "services",
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"node_output": "Icinga 2 has been running for 26 minutes and 1 second. Version: r2.6.0-1",
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"node_output": "OK - load average: 0.00, 0.05, 0.11",
"node_display_name": "load",
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"node_display_name": "ping4",
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"node_display_name": "ssh",
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"node_display_name": "ping4",
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"node_output": "SSH OK - OpenSSH_6.7p1 Debian-5+deb8u3 (protocol 2.0) ",
"node_display_name": "ssh",
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"node_output": "Icinga 2 has been running for 26 minutes and 16 seconds. Version: r2.6.0-1",
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"node_output": "OK - load average: 0.00, 0.05, 0.11",
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}, {
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}, {
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"node_output": "SSH OK - OpenSSH_6.7p1 Debian-5+deb8u3 (protocol 2.0) ",
"node_display_name": "ssh",
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}, {
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"node_output": "Icinga 2 has been running for 26 minutes and 39 seconds. Version: r2.6.0-1",
"node_display_name": "icinga",
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}, {
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"node_output": "OK - load average: 0.00, 0.05, 0.11",
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}, {
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"node_output": "PING OK - Packet loss = 0%, RTA = 0.20 ms",
"node_display_name": "ping4",
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}, {
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"node_output": "SSH OK - OpenSSH_6.7p1 Debian-5+deb8u3 (protocol 2.0) ",
"node_display_name": "ssh",
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}, {
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"node_output": "APT CRITICAL: 153 packages available for upgrade (96 critical updates). ",
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}, {
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"node_group_alias": "Disk Checks",
"node_output": "DISK OK - free space: / 2769 MB (79% inode=92%): /usr 4913 MB (70% inode=78%): /mnt/fornfs/nfs_svn 118535 MB (66% inode=94%): /mnt/fornfs/nfs_ftp 43998 MB (24% inode=99%): /mnt/fornfs/nfs_dxllf 720829 MB (73% inode=99%): /var 2004 MB (57% inode=96%): /home 6983 MB (99% inode=99%): /proxmox 368883 MB (77% inode=99%): /backup 64162 MB (83% inode=99%): /mnt/fornfs/nfs_deve 91754 MB (96% inode=99%): /mnt/itsm 95443 MB (99% inode=99%): /yuyin/movies/disk2 782 MB (86% inode=98%): /mnt/user_bak 126959 MB (66% inode=99%): /mnt/itsupp 208240 MB (36% inode=99%): /yuyin/movies/disk1 422 MB (46% inode=95%): /ownCloud 270943 MB (93% inode=99%): /var/lib/mysql 9362 MB (99% inode=99%):",
"node_display_name": "disk",
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}, {
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"node_ins_id": 1,
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"node_group_alias": "Disk Checks",
"node_output": "DISK OK - free space: / 2769 MB (79% inode=92%): /usr 4913 MB (70% inode=78%): /mnt/fornfs/nfs_svn 118535 MB (66% inode=94%): /mnt/fornfs/nfs_ftp 43998 MB (24% inode=99%): /mnt/fornfs/nfs_dxllf 720829 MB (73% inode=99%): /var 2004 MB (57% inode=96%): /home 6983 MB (99% inode=99%): /proxmox 368883 MB (77% inode=99%): /backup 64162 MB (83% inode=99%): /mnt/fornfs/nfs_deve 91754 MB (96% inode=99%): /mnt/itsm 95443 MB (99% inode=99%): /yuyin/movies/disk2 782 MB (86% inode=98%): /mnt/user_bak 126959 MB (66% inode=99%): /mnt/itsupp 208240 MB (36% inode=99%): /yuyin/movies/disk1 422 MB (46% inode=95%): /ownCloud 270943 MB (93% inode=99%): /var/lib/mysql 9362 MB (99% inode=99%):",
"node_display_name": "disk",
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"node_output": "DISK OK - free space: / 2769 MB (79% inode=92%):",
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"node_output": "HTTP OK: HTTP/1.1 200 OK - 10975 bytes in 0.001 second response time ",
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"node_output": "HTTP OK: HTTP/1.1 200 OK - 10975 bytes in 0.001 second response time ",
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