forked from docs/doc-exports
Wang , Deng Ke
ba65944bfd
Reviewed-by: Boka, Ladislav <ladislav.boka@t-systems.com> Co-authored-by: Wang , Deng Ke <wangdengke2@huawei.com> Co-committed-by: Wang , Deng Ke <wangdengke2@huawei.com>
18 lines
3.9 KiB
HTML
18 lines
3.9 KiB
HTML
<a name="dds_03_0050"></a><a name="dds_03_0050"></a>
|
|
|
|
<h1 class="topictitle1">Manually Switching the Primary and Secondary Nodes of a Replica Set</h1>
|
|
<div id="body1553044711353"><div class="section" id="dds_03_0050__section34286219201027"><h4 class="sectiontitle"><strong id="dds_03_0050__b171220478248">Scenarios</strong></h4><p id="dds_03_0050__en-us_topic_0089917846_p8277342389">A replica set consists of the primary node, secondary node, and hidden node. Primary and secondary nodes allow access from external services by providing IP addresses. Hidden nodes are only used for backing up data. When a primary node becomes faulty, the system automatically selects a new primary node to ensure high availability. In addition, DDS supports the primary/secondary switchover so you can perform switchovers in scenarios such as disaster recovery.</p>
|
|
<div class="note" id="dds_03_0050__note2200417585627"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="dds_03_0050__ul118567397252"><li id="dds_03_0050__li7762184413252">You can perform a switchover when the DB instance status is <strong id="dds_03_0050__b11203550153715">Available</strong>, or <strong id="dds_03_0050__b94563010411">Changing a security group</strong>.</li><li id="dds_03_0050__li1758118610292">The database connection may be interrupted during the switchover. Ensure that your client supports reconnection.</li><li id="dds_03_0050__li175947591493">The longer the delay for primary/secondary synchronization, the more time is needed for a primary/secondary switchover. Therefore, if the primary to secondary synchronization delay exceeds 300s, the primary/secondary switchover is not allowed. For details about the synchronization delay, see <a href="dds_faq_0006.html">What Is the Time Delay for Primary/Secondary Synchronization in a Replica Set?</a></li></ul>
|
|
</div></div>
|
|
</div>
|
|
<div class="section" id="dds_03_0050__section79281543052"><h4 class="sectiontitle">Procedure</h4><ol id="dds_03_0050__ol1470917142592"><li id="dds_03_0050__li312682313217"><span><a href="dds_02_0043.html">Log in to the DDS console.</a></span></li><li id="dds_03_0050__li1871461413595"><span>On the <strong id="dds_03_0050__b5134624104315">Instance Management</strong> page, click the target replica set instance.</span></li><li id="dds_03_0050__li19716514155911"><span>In the <strong id="dds_03_0050__b23351848105211">Node Information</strong> area on the <strong id="dds_03_0050__b9336848125216">Basic Information</strong> page, click <strong id="dds_03_0050__b433614865216">Switch</strong>.</span></li><li id="dds_03_0050__li17718141416595"><span>In the displayed dialog box, click <strong id="dds_03_0050__b1693492973613">Yes</strong>.</span></li><li id="dds_03_0050__li13734014125918"><span>Check the result.</span><p><ul id="dds_03_0050__ul663314386812"><li id="dds_03_0050__li14634738388">During the switchover process, the DB instance status changes to <span class="uicontrol" id="dds_03_0050__uicontrol581534113379"><b>Switchover in progress</b></span>. After the switchover is complete, the status is restored to <span class="uicontrol" id="dds_03_0050__uicontrol179183518422"><b>Available</b></span>.</li><li id="dds_03_0050__li1663916381689">In the <span class="uicontrol" id="dds_03_0050__uicontrol1245214463422"><b>Node Information</b></span> area, you can view the switchover result.</li><li id="dds_03_0050__li5601319152015">After the switchover, the previous primary node becomes the secondary node. You need to reconnect to the primary node. For details, see <a href="en-us_topic_0105284966.html">Connecting to a Replica Set Instance Over Private Networks</a> and <a href="dds_02_0047.html">Connecting to a Replica Set Instance Over Public Networks</a>.</li></ul>
|
|
</p></li></ol>
|
|
</div>
|
|
</div>
|
|
<div>
|
|
<div class="familylinks">
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="dds_03_0002.html">Instance Management</a></div>
|
|
</div>
|
|
</div>
|
|
|