high-availability

rabbitmq HA cluster

由 让人想犯罪 __ 提交于 2020-01-13 13:12:14
问题 I am wanting to setup RabbitMQ as a two (or more) node cluster with HA. Use case: a client producer app (C#.NET) knows that the cluster has two nodes and publishes to the cluster. Various consumer apps (also C#.NET) connect to the cluster and get all messages generated by the producer. So long as at least one node is up and running the producer and consumers will all continue to work without error. Supposing nodes A and B are running and B dies for a while, then gets restarted, then a while

rabbitmq HA cluster

由 ♀尐吖头ヾ 提交于 2020-01-13 13:12:06
问题 I am wanting to setup RabbitMQ as a two (or more) node cluster with HA. Use case: a client producer app (C#.NET) knows that the cluster has two nodes and publishes to the cluster. Various consumer apps (also C#.NET) connect to the cluster and get all messages generated by the producer. So long as at least one node is up and running the producer and consumers will all continue to work without error. Supposing nodes A and B are running and B dies for a while, then gets restarted, then a while

Scaling database in a microservice architecture

由 二次信任 提交于 2020-01-02 08:56:52
问题 Lets say we have 5 microservices (μS) and each microservice requires one database with a few tables. Each of these services needs to be able to scale including the database queries. To do that we have a few options that I know of: 1. 1-μS; 1 instance; 1 DB instance Don't scale horizontally, just vertically. 2. 1-μS; N instances; 1 DB instance Every instance of a service gets to read and write to the same database. Simple way to scale if the service processing is the bottleneck. 3. 1-μS; N

How to load balance Kafka Boostrap with haproxy?

由 和自甴很熟 提交于 2020-01-02 08:19:23
问题 I have a kafka cluster consisting of 3 machines running on AWS: kafka1 to kafka3 I'm using the new style kafka consumers (>0.8). I know that the kafka client connects to one of the kafka servers, grabs server metadata and then connects to the brokers directly. I want to ensure that in the case of a broker failure that the clients are still able to grab metadata. For this I have an HAProxy load balancer with the following config: listen kafka bind *:9092 mode tcp balance roundrobin no option

Microservices not registering on all Eureka Instances

由 杀马特。学长 韩版系。学妹 提交于 2019-12-31 03:48:39
问题 Spring Boot version: 2.1.6.RELEASE Spring Cloud Version: Greenwich.SR1 Objective is to set up two instances of Eureka Servers in a cluster and have all microservices registered to both, in order to achieve HA. Currently I am testing this on my local machine running Ubuntu 18.04. So as mentioned in the official docs, I have set up the peer to peer awareness of Eureka Instances. On bringing both the Eureka Server Instances up, on the dashboard of Instance-1(Port 8080) under available replicas

Apache flink on Kubernetes - Resume job if jobmanager crashes

由 蹲街弑〆低调 提交于 2019-12-30 02:33:05
问题 I want to run a flink job on kubernetes, using a (persistent) state backend it seems like crashing taskmanagers are no issue as they can ask the jobmanager which checkpoint they need to recover from, if I understand correctly. A crashing jobmanager seems to be a bit more difficult. On this flip-6 page I read zookeeper is needed to be able to know what checkpoint the jobmanager needs to use to recover and for leader election. Seeing as kubernetes will restart the jobmanager whenever it crashes

Demystifying High Availability in Kubernetes Using Kubeadm

由 ▼魔方 西西 提交于 2019-12-27 09:49:29
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> Sign in Get started CLOUD COMPUTING MACHINE LEARNING DEVOPS SOFTWARE Demystifying High Availability in Kubernetes Using Kubeadm Velotio Technologies Follow Jan 17 · 6 min read Introduction The rise of containers has reshaped the way we develop, deploy and maintain the software. Containers allow us to package the different services that constitute an application into separate containers, and to deploy those containers across a set of virtual and physical machines. This gives rise to container orchestration tool to automate the deployment, management, scaling

Can't locate Switch.pm in INC的解决

由 独自空忆成欢 提交于 2019-12-26 18:18:09
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> rhel7.4上对oracle 11.2.0.4打psu,直接就报这个错误: [root@hisdb1 grid]# /u01/app/grid/product/11.2.0/grid/OPatch/opatch auto /u01/setup/psu/26635745/ -ocmrf /u01/setup/psu/ocm.rsp Can't locate Switch.pm in @INC ( @INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at /u01/app/grid/product/11.2.0/grid/OPatch/crs/auto_patch.pl line 2730. BEGIN failed--compilation aborted at /u01/app/grid/product/11.2.0/grid/OPatch/crs/auto_patch.pl line 2730. [root@hisdb1 grid]# 这个是perl5

禁用”mgmtdb实例导致12c 应用psu失败

由 主宰稳场 提交于 2019-12-26 18:15:59
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 12c安装集群的时候会创建一个 mgmtdb实例 ，这个实例是一个单实例，只能运行在一个节点上。我在之前实验的时候把该实例的 内存 调到了400m（为节约系统资源），由于 内存 过低，该实例在集群启动的时候就不会自动启动。在节点1实验打 psu 的时候，报错了，日志如下： Oracle Cluster ware active version on the cluster is [12.2.0.1.0]. The cluster upgrade state is [ ROLLING PATCH ]. The cluster active patch level is [0]. PRCR-1013 : Failed to start resource ora. mgmtdb PRCR-1064 : Failed to start resource ora.mgmtdb on node rac01 CRS-5017: The resource action "ora.mgmtdb start" encountered the following error: ORA-01078: failure in processing system parameters . For details refer to "(

Exception thrown when connecting Neo4j+HA and Spring Data"org.neo4j.kernel.extension.KernelExtensions@3b756db3'

由 对着背影说爱祢 提交于 2019-12-24 21:27:56
问题 I am trying to create a sample node in Neo4j Graph DB but getting an exception when starting tomcat. I am using Neo4j+HA+Spring Data Graph Repository to create a node. I am sure there is something wrong on how I configured. I am getting below exception. All my 3 neo4j clusters are configured and started.I used exact configuration as specified in the link Neo4j HA Conf Tutorial Let me know if you want me to paste any of other code/classes. I also see that "org.neo4j.kernel
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