kubernetes log 流式資料處理
阿新 • • 發佈:2018-12-12
PS: 最近在重構公司的業務容器化平臺,記錄一塊。關於容器日誌的, kubernetes python API本身提供了日誌流式資料,在以前的版本是不會輸出新資料的,後續版本進行了改進。
直接上程式碼
Flask 前端路由塊
# Router """獲取專案pod的日誌""" @api_cluster_pod.route('/<env>/<cluster_name>/pod/<pod_name>/log') @env_rules def api_cluster_pod_log(env, cluster_name, pod_name): """檢視pod的log""" tail_lines = request.values.get("tail_lines", 1000) namespace = request.values.get("namespace", "") # 生成Config Object try: cluster_config = ClusterConfig( env=env, cluster_name=cluster_name, namespace=namespace ) except Exception as e: return jsonify(dict( code=5000, message='獲取叢集介面時未找到對應條目, 資訊:{0}'.format(str(e)) )) try: poder = Pod( cluster_config) resp = Response(stream_with_context(poder.get_pod_log(pod_name, tail_lines)), mimetype="text/plain") return resp except Exception as e: return jsonify(dict( code=7000, message=str(e) ))
Flask 後端程式碼塊
# 後臺功能 class Pod: ... def get_pod_log(self, pod_name, tail_lines=100): """ 獲取pod的日誌 :param tail_lines: # 顯示最後多少行 :return: """ try: # stream pod log streams = self.cluster.api.read_namespaced_pod_log( pod_name, self.cluster_config.namespace, follow=True, _preload_content=False, tail_lines=tail_lines).stream() return streams except ApiException as e: if e.status == 404: logger.exception("Get Log not fund Podname: {0}".format(pod_name)) raise PodNotFund("獲取日誌時,未找到此pod: {0}".format(pod_name)) if e.status == 400: raise PodNotFund("容器並未建立成功,請聯絡運維人員進行排查。") raise e except Exception as e: logger.exception("Get Log Fail: {0}".format(str(e))) raise e
HTML
<!DOCTYPE> <html> <head> <title>Flushed ajax test</title> <meta charset="UTF-8" /> <script type="text/javascript" src="https://cdn.bootcss.com/jquery/3.0.0/jquery.min.js"></script> <style> #log-container { height: 800px; /*width: 800px;*/ overflow-x: scroll; padding: 10px; } .logs { background-color: black; color: aliceblue; font-size: 18px; } </style> </head> <body> <div id="log-container"> <pre class="logs"> </pre> </div> <script type="text/javascript"> var last_response_len = false; var logs = $("#log-container"); $.ajax('http://localhost/api/pre/ops-test/pod/ops-test-1211763235-jfbst/log?tail_lines=100', { xhrFields: { onprogress: function(e) { var this_response, response = e.currentTarget.response; if(last_response_len === false) { this_response = response; last_response_len = response.length; } else { this_response = response.substring(last_response_len); last_response_len = response.length; } // console.log(this_response); // 接收服務端的實時日誌並新增到HTML頁面中 $("#log-container pre").append(this_response); // 滾動條滾動到最低部 $("#log-container").scrollTop($("#log-container pre").height() - $("#log-container").height() + 10); } } }) .done(function(data) { console.log('Complete response = ' + data); }) .fail(function(data) { console.log('Error: ', data); }); console.log('Request Sent'); </script> </body> </html>
其它
我們應用是前後端分離的,把html裡面的核心程式碼放置VUE裡面就可以了。
效果圖
日誌是流式的,如果Container有日誌,則視窗會運態更新。