openstack ha

Pfsense HA (high availability cluster)0x00 Preface Some time ago, the company's firewall physical machine crashed, causing the company's network paralysis. My company's websites are inaccessible, so I thought of studying this Pfsense HA. The company is preparing to hold a competition. As a security worker, there must be pressure !! All aspects should consider whether there are security risks. This firewall

Resource Manager ha is a feature that Hadoop has introduced since 2.4, providing redundancy in a active/standby way to eliminate the risk of a single point of failure.1, the overall structure:650) this.width=650; "Src=" http://hadoop.apache.org/docs/stable/hadoop-yarn/hadoop-yarn-site/images/ Rm-ha-overview.png "alt=" Overview of ResourceManager High Availability "/>2, failover: There are two forms of autom

Use Nginx + Lua to proxy Hadoop HA and nginxhadoop I,Hadoop HAOfWebPage access After Hadoop enables HA, there will be two Master components to provide services at the same time. The component in use is called Active, and the other is called Standby as backup, such as HDFS NameNode and YARN ResourceManager. HDFS web pages can be accessed only through Active NameNode. Similarly, YARN web pages can be accesse

When HA is turned on in the cluster environment, it is sometimes found that VMs in the outage host cannot be restarted on other hosts in the cluster, prompting the failure of HA resource switching to occur because the access control policy for HA in cluster is not configured correctly. VMS on the outage host are not able to get enough resources on other hosts in

First, the concept of heartbeat Linux-ha's full name is High-availability Linux, an Open-source project, the goal of which is to provide an enhanced Linux reliability (reliability), through the joint efforts of Community developers The availability (availability) and serviceability (serviceability) (RAS) cluster solution. Heartbeat is a component of the Linux-ha project and the most successful example of the current open source

At the OpenStack summit in Atlanta, RedHat confirmed several OpenStack-related projects. One of them is that RedHat is working with eNovance, the leader in the open-source cloud computing market. Both parties will promote network function virtualization and integrate telecom functions into OpenStack. Red Hat announced that it would invest in eNovance in cash and

After six months of Public Beta, unitedstack (Beijing) Technology Co., Ltd. (hereinafter referred to as unitedstack) has developed the openstack cloud service platform UOS 2.0 for commercial use recently. In the words of cheng hui, founder of unitedstack, UOS 2.0 is China's first cloud computing platform to officially provide operation services to external users based entirely on the openstack open standard

I. what is the course (comprehensive introduction)1.1 . Background of the course OpenStack is an open source project initiated by Rackspace, a global developer, designed to create a cloud-based platform that is easy to deploy, feature rich, and easy to scale. OpenStack attempts to become a data center operating system, the cloud operating system. Since the start of the project,

hosts (Devstack-controller and devstack-compute1 in our experimental environment), followed by a filter of 9 filter (Retryfilter, Availabilityzonefilter, Ramfilter,Diskfilter, Computefilter, Computecapabilitiesfilter, Imagepropertiesfilter,Servergroupantiaffinityfilter, Servergroupaffinityfilter), two compute nodes have passed.Then it's time to weight the following:You can see that because Devstack-controller has more free memory than devstack-compute1 (7466 > 3434), the weight value is large (

1, HA cluster introductionHa (high available) is highly available and is also known as a dual-machine hot standby for critical business. As can be understood, there are two machines A and B, under normal circumstances, a provides services, B standby idle, when a down or service outage, will switch to B machine continue to provide the service. Commonly used high-availability open source software has heartbeat and keepalived, where keepalived has load-b

Generally, there are three types of Server clusters: HA clusters can replace disk arrays to provide hot backup between cluster nodes; The LB cluster can provide dynamic loads and virtual hosts; HP clusters provide high-performance computing clusters. HA, as a high-availability cluster, provides continuous service assurance. In the past few days, a project has used a Linux cluster and the configuration proce

HA (High available) is a highly available, also known as dual-machine hot standby for critical business. The simple understanding is that there are two machines A and B, normally a service, B standby idle, when a down or service outage, will switch to the B machine to continue to provide services. Commonly used high-availability open source software has heartbeat and keepalived, where keepalived has load-balanced functionality. Below we use heartbeat

Test environment:5 nodes ((controller,2 network,2 compute nodes))Using Vxlan+linux Bridge Determine that all neutron and Nova services are running Nova service-listNeutron agent-list2. Creation of 2 networksA) neutron net-create privateNeutron subnet-create–name private-subnet Private 10.0.0.0/29b) Neutron net-create private1Neutron subnet-create–name private1-subnet private1 10.0.1.0/293. Create a shared public network to connect to the physical network Physnet1Neutron net-create–

DAS.ALLOWNETWORKX-Allows specific management networks to be specified for vsphere ha's heartbeat network, x can be Arabic numerals 0-9. This option is not valid when the Vsan function is activated in 5.5. Das.ignoreredundantnetwarning-If ESXi host under vsphere Ha management does not have redundant networks, it will be alerted, so you can skip the alert with this parameter; Das.heartbeatdsperhost-vsphere ha