sudo hostnamectl set-hostname <hostname><\/code><\/pre>\n\n\n\nNow you can add the hostname and the IP addresses of each node to the \/etc\/hosts file on each node.<\/p>\n\n\n\n
It should look something like the following. In my case, I’ve named the nodes tdc01, tdc02 and tdc03 and their IP addresses are dynamically assigned by the VirtualBox NAT Network that you created earlier. You can also choose static IP addresses if you want.<\/p>\n\n\n\n
127.0.0.1 localhost\n10.0.2.4 tdc01\n10.0.2.5 tdc03\n10.0.2.6 tdc02\n\n# The following lines are desirable for IPv6 capable hosts\n::1 ip6-localhost ip6-loopback\nfe00::0 ip6-localnet\nff00::0 ip6-mcastprefix\nff02::1 ip6-allnodes\nff02::2 ip6-allrouters<\/code><\/pre>\n\n\n\nYou should also ensure that each of the nodes can ping the other nodes using the hostnames that you have given them, after you edit the \/etc\/hosts files on each node.<\/p>\n\n\n\n
Deploy and start the cluster<\/h3>\n\n\n\n
Now we can start the process of creating and deploying a TDengine HA cluster.<\/p>\n\n\n\n
Install the latest TDengine version on your first node<\/h4>\n\n\n\n
On this node you will leave the FQDN blank since you are setting up the cluster. This node will be the first EP (first End Point) of the cluster.<\/p>\n\n\n\n
tdengine@tdc01:~\/downloads$ sudo dpkg --install TDengine-server-3.1.0.0-Linux-x64.deb \nSelecting previously unselected package tdengine.\n(Reading database ... 186303 files and directories currently installed.)\nPreparing to unpack TDengine-server-3.1.0.0-Linux-x64.deb ...\nUnpacking tdengine (3.1.0.0) ...\nSetting up tdengine (3.1.0.0) ...\n.\/post.sh: line 107: \/var\/log\/taos\/tdengine_install.log: No such file or directory\nStart to install TDengine...\n.\/post.sh: line 107: \/var\/log\/taos\/tdengine_install.log: No such file or directory\n\nSystem hostname is: tdc01\n\nEnter FQDN:port (like h1.taosdata.com:6030) of an existing TDengine cluster node to join\nOR leave it blank to build one:\n\nEnter your email address for priority support or enter empty to skip: \nCreated symlink \/etc\/systemd\/system\/multi-user.target.wants\/taosd.service \u2192 \/etc\/systemd\/system\/taosd.service.\n\nTo configure TDengine : edit \/etc\/taos\/taos.cfg\nTo start TDengine : sudo systemctl start taosd\nTo access TDengine : taos -h tdc01 to login into TDengine server\n\n\nTDengine is installed successfully!\nProcessing triggers for man-db (2.10.2-1) ...<\/code><\/pre>\n\n\n\nInstall TDengine on the remaining nodes<\/h4>\n\n\n\n
When you install TDengine on the remaining nodes, you must enter the hostname:port of the first node. In my case, it is: tdc01:6030 as shown below.<\/p>\n\n\n\n
System hostname is: tdc02\n\nEnter FQDN:port (like h1.taosdata.com:6030) of an existing TDengine cluster node to join\nOR leave it blank to build one:tdc01:6030\n\nEnter your email address for priority support or enter empty to skip: \nCreated symlink \/etc\/systemd\/system\/multi-user.target.wants\/taosd.service \u2192 \/etc\/systemd\/system\/taosd.service.\n\nTo configure TDengine : edit \/etc\/taos\/taos.cfg\nTo start TDengine : sudo systemctl start taosd\nTo access TDengine : taos -h tdc01 -P 6030 to login into cluster, then\nexecute : create dnode 'newDnodeFQDN:port'; to add this new node\n\n\nTDengine is installed successfully!\nProcessing triggers for man-db (2.10.2-1) ...\n<\/code><\/pre>\n\n\n\nAdd the nodes to the cluster<\/h4>\n\n\n\n
Please ensure that the taosd<\/code> service is running on each node.<\/p>\n\n\n\nTo start taosd<\/code> you can use the following:<\/p>\n\n\n\nsudo systemctl start taosd<\/code><\/pre>\n\n\n\nThen start the taos CLI on any node and add the nodes as follows:<\/p>\n\n\n\n
taos> create dnode 'tdc02:6030';\nCreate OK, 0 row(s) affected (0.009944s)\n\ntaos> show dnodes;\n id | endpoint | vnodes | support_vnodes | status | create_time | reboot_time | note |\n====================================================================================================================================================================\n 1 | tdc01:6030 | 0 | 4 | ready | 2023-09-04 18:58:10.391 | 2023-09-04 18:58:10.367 | |\n 2 | tdc02:6030 | 0 | 4 | ready | 2023-09-04 19:01:21.746 | 2023-09-04 19:00:18.628 | |\nQuery OK, 2 row(s) in set (0.003692s)\n\ntaos> create dnode 'tdc03:6030';\nCreate OK, 0 row(s) affected (0.010349s)\n\ntaos> show dnodes;\n id | endpoint | vnodes | support_vnodes | status | create_time | reboot_time | note |\n====================================================================================================================================================================\n 1 | tdc01:6030 | 0 | 4 | ready | 2023-09-04 18:58:10.391 | 2023-09-04 18:58:10.367 | |\n 2 | tdc02:6030 | 0 | 4 | ready | 2023-09-04 19:01:21.746 | 2023-09-04 19:00:18.628 | |\n 3 | tdc03:6030 | 0 | 4 | ready | 2023-09-04 19:02:48.980 | 2023-09-04 19:02:40.144 | |\nQuery OK, 3 row(s) in set (0.001831s)\n<\/code><\/pre>\n\n\n\nCheck the number of mnodes<\/h4>\n\n\n\n
If you read the documentation on the distributed logical architecture of TDengine, you may recall that an “mnode” is a logical unit, part of taosd, that manages and monitors the running status of all data nodes (dnodes) and also manages and stores metadata. By default only 1 mnode is created.<\/p>\n\n\n\n
taos> show mnodes;\n id | endpoint | role | status | create_time | role_time |\n==============================================================================================================================\n 1 | tdc01:6030 | leader | ready | 2023-09-04 18:58:10.393 | 2023-09-04 18:58:10.385 |\nQuery OK, 1 row(s) in set (0.002263s)<\/code><\/pre>\n\n\n\nAdd mnodes<\/h4>\n\n\n\n
For HA, we must add 2 more mnodes on dnodes 2 and 3.<\/p>\n\n\n\n
taos> create mnode on dnode 2;Create OK, 0 row(s) affected (4.062746s)taos> show mnodes; id | endpoint | role | status | create_time | role_time |============================================================================================================================== 1 | tdc01:6030 | leader | ready | 2023-09-04 18:58:10.393 | 2023-09-04 18:58:10.385 | 2 | tdc02:6030 | follower | ready | 2023-09-04 20:23:33.318 | 2023-09-04 20:23:37.365 |Query OK, 2 row(s) in set (0.002233s)<\/code><\/pre>\n\n\n\ntaos> create mnode on dnode 3;\nCreate OK, 0 row(s) affected (4.077106s)\n\ntaos> show mnodes;\n id | endpoint | role | status | create_time | role_time |\n==============================================================================================================================\n 1 | tdc01:6030 | leader | ready | 2023-09-04 18:58:10.393 | 2023-09-04 18:58:10.385 |\n 2 | tdc02:6030 | follower | ready | 2023-09-04 20:23:33.318 | 2023-09-04 20:23:37.365 |\n 3 | tdc03:6030 | follower | ready | 2023-09-04 20:24:38.435 | 2023-09-04 20:24:42.501 |\nQuery OK, 3 row(s) in set (0.004268s)<\/code><\/pre>\n\n\n\nDemonstrate High Availability<\/h2>\n\n\n\n
Now we use the tool taosBenchmark to create a database. By default taosBenchmark will create a very large database with 100 million rows, but for the purposes of this blog we create a small database to show how HA works.<\/p>\n\n\n\n
Note that you must install taosTools in order to have taosBenchmark installed.<\/p>\n\n\n\n
Create a small database of simulated Smart Meter data<\/h3>\n\n\n\ntdengine@tdc01:~$ taosBenchmark -I stmt -d test -n 100 -t 100 -a 3\n[09\/04 20:28:19.612119] INFO: client version: 3.1.0.0\n\n Press enter key to continue or Ctrl-C to stop\n\nfailed to create dir:\/var\/log\/taos\/ since Operation not permitted WARING: Create taoslog failed:Operation not permitted. configDir=\/etc\/taos\/\n[09\/04 20:28:27.559290] INFO: command to create database: <CREATE DATABASE IF NOT EXISTS test VGROUPS 1 replica 3 PRECISION 'ms';>\n[09\/04 20:28:27.569557] SUCC: created database (test)\n[09\/04 20:28:27.575220] WARN: failed to run command DESCRIBE `test`.`meters`, code: 0x80002603, reason: Table does not exist\n[09\/04 20:28:27.575403] INFO: stable meters does not exist, will create one\n[09\/04 20:28:27.575465] INFO: create stable: <CREATE TABLE test.meters (ts TIMESTAMP,current float,voltage int,phase float) TAGS (groupid int,location binary(24))>\n[09\/04 20:28:27.582501] INFO: generate stable<meters> columns data with lenOfCols<80> * prepared_rand<10000>\n[09\/04 20:28:27.593078] INFO: generate stable<meters> tags data with lenOfTags<62> * childTblCount<100>\n[09\/04 20:28:27.598267] INFO: start creating 100 table(s) with 8 thread(s)\n.\n.\n.\n.\n.\n[09\/04 20:28:29.828752] INFO: Total 100 tables on bb test's vgroup 0 (id: 2)\n[09\/04 20:28:29.833427] INFO: Estimate memory usage: 3.93MB\n\n Press enter key to continue or Ctrl-C to stop\n\n[09\/04 20:28:37.095207] INFO: pthread_join 0 ...\n[09\/04 20:28:37.201477] SUCC: thread[0] progressive mode, completed total inserted rows: 10000, 97145.85 records\/second\n[09\/04 20:28:37.201584] SUCC: Spent 0.106339 seconds to insert rows: 10000 with 1 thread(s) into test 94038.88 records\/second\n[09\/04 20:28:37.201593] SUCC: insert delay, min: 0.4890ms, avg: 1.0294ms, p90: 1.3420ms, p95: 3.5180ms, p99: 11.9660ms, max: 11.9660ms<\/code><\/pre>\n\n\n\nNote that you will have to press the “Enter” key when prompted and there will be several lines of output. We are only displaying the first few lines and the last few lines.<\/p>\n\n\n\n
Check the number of rows in the database<\/h3>\n\n\n\ntaos> select count(*) from test.meters; count(*) |======================== 10000 |Query OK, 1 row(s) in set (0.020480s)<\/code><\/pre>\n\n\n\nSee the distribution of vgroups<\/h3>\n\n\n\n
Vnodes on different data nodes can form a virtual node group to ensure the high availability of the system.<\/p>\n\n\n\n
As you can see below, there is one vgroup.<\/p>\n\n\n\n
taos> show test.vgroups\\G;\n*************************** 1.row ***************************\n vgroup_id: 2\n db_name: test\n tables: 100\n v1_dnode: 1\n v1_status: leader\n v2_dnode: 2\n v2_status: follower\n v3_dnode: 3\n v3_status: follower\n v4_dnode: NULL\n v4_status: NULL\n cacheload: 0\ncacheelements: 0\n tsma: 0\nQuery OK, 1 row(s) in set (0.005120s)<\/code><\/pre>\n\n\n\nCreate a new database with 3 replicas to test HA<\/h3>\n\n\n\ntaos> create database if not exists testha replica 3;\nCreate OK, 0 row(s) affected (6.371307s)\n\ntaos> show databases;\n name |\n=================================\n information_schema |\n performance_schema |\n test |\n testha |\nQuery OK, 4 row(s) in set (0.002791s)<\/code><\/pre>\n\n\n\nCreate a table named t1 and insert some data into it.<\/p>\n\n\n\n
taos> use testha;\nDatabase changed.\n\ntaos> create table if not exists t1(ts timestamp, n int);\nCreate OK, 0 row(s) affected (0.001430s)\n\ntaos> insert into t1 values(now, 1)(now+1s, 2)(now +2s,3)(now+3s,4);\nInsert OK, 4 row(s) affected (0.005576s)\n\ntaos> select * from t1;\n ts | n |\n========================================\n 2023-09-04 20:42:00.449 | 1 |\n 2023-09-04 20:42:01.449 | 2 |\n 2023-09-04 20:42:02.449 | 3 |\n 2023-09-04 20:42:03.449 | 4 |\nQuery OK, 4 row(s) in set (0.001884s)<\/code><\/pre>\n\n\n\nCheck online dnodes<\/h3>\n\n\n\ntaos> show dnodes; id | endpoint | vnodes | support_vnodes | status | create_time | reboot_time | note |=================================================================================================================================================================== 1 | tdc01:6030 | 3 | 4 | ready | 2023-09-04 18:58:10.391 | 2023-09-04 18:58:10.367 | | 2 | tdc02:6030 | 3 | 4 | ready | 2023-09-04 19:01:21.746 | 2023-09-04 19:00:18.628 | | 3 | tdc03:6030 | 3 | 4 | ready | 2023-09-04 19:02:48.980 | 2023-09-04 19:02:40.144 | |Query OK, 3 row(s) in set (0.004388s)<\/code><\/pre>\n\n\n\nRAFT Protocol<\/h3>\n\n\n\n
TDengine uses the RAFT protocol for data replication. For the RAFT protocol to work, it needs a quorum of (N\/2)+1 nodes and can tolerate a failure of (N-1)\/2 nodes in the cluster.<\/p>\n\n\n\n
Disconnect the tdc01 node<\/h3>\n\n\n\n
You can either power off the VM or just disconnect the network.<\/p>\n\n\n\n
taos> show dnodes; id | endpoint | vnodes | support_vnodes | status | create_time | reboot_time | note |===================================================================================================================================================================<strong>1<\/strong><strong>|<\/strong><strong> tdc01:<\/strong><strong>6030<\/strong><strong>|<\/strong><strong>3<\/strong><strong>|<\/strong><strong>0<\/strong><strong>|<\/strong><strong> offline <\/strong><strong>|<\/strong><strong>2023-09-04<\/strong><strong>18<\/strong><strong>:<\/strong><strong>58<\/strong><strong>:<\/strong><strong>10.391<\/strong><strong>|<\/strong><strong>1969-12-31<\/strong><strong>16<\/strong><strong>:<\/strong><strong>00<\/strong><strong>:<\/strong><strong>00.000<\/strong><strong>|<\/strong><strong> status <\/strong><strong>not<\/strong><strong> received <\/strong>| 2 | tdc02:6030 | 3 | 4 | ready | 2023-09-04 19:01:21.746 | 2023-09-04 19:00:18.628 | | 3 | tdc03:6030 | 3 | 4 | ready | 2023-09-04 19:02:48.980 | 2023-09-04 19:02:40.144 | |Query OK, 3 row(s) in set (0.004617s)<\/code><\/pre>\n\n\n\nInsertion and querying still works<\/h3>\n\n\n\ntaos> insert into testha.t1 values(now, 1)(now+1s, 2);\nInsert OK, 2 row(s) affected (0.002733s)\n\ntaos> select count(*) from testha.t1;\n count(*) |\n========================\n 6 |\nQuery OK, 1 row(s) in set (0.013952s)\n\ntaos> insert into testha.t1 values(now, 1)(now+1s, 2);\nInsert OK, 2 row(s) affected (0.002751s)\n\ntaos> select count(*) from testha.t1;\n count(*) |\n========================\n 8 |\nQuery OK, 1 row(s) in set (0.002328s)\n\ntaos> select * from testha.t1;\n ts | n |\n========================================\n 2023-09-04 20:42:00.449 | 1 |\n 2023-09-04 20:42:01.449 | 2 |\n 2023-09-04 20:42:02.449 | 3 |\n 2023-09-04 20:42:03.449 | 4 |\n 2023-09-04 20:47:58.913 | 1 |\n 2023-09-04 20:47:59.913 | 2 |\n 2023-09-04 20:49:20.395 | 1 |\n 2023-09-04 20:49:21.395 | 2 |\nQuery OK, 8 row(s) in set (0.003532s)<\/code><\/pre>\n\n\n\nRestore node tdc01<\/h3>\n\n\n\n
As soon as node tdc01 is restored, it rejoins the cluster.<\/p>\n\n\n\n
Note that the mnodes leader is tdc03.<\/p>\n\n\n\n
taos> show dnodes;\n id | endpoint | vnodes | support_vnodes | status | create_time | reboot_time | note |\n===========================================================================================================================================================================\n 1 | tdc01:6030 | 3 | 4 | ready | 2023-09-04 18:58:10.391 | 2023-09-04 20:50:34.226 | |\n 2 | tdc02:6030 | 3 | 4 | ready | 2023-09-04 19:01:21.746 | 2023-09-04 19:00:18.628 | |\n 3 | tdc03:6030 | 3 | 4 | ready | 2023-09-04 19:02:48.980 | 2023-09-04 19:02:40.144 | |\nQuery OK, 3 row(s) in set (0.002064s)<\/code><\/pre>\n\n\n\ntaos> show mnodes;\n id | endpoint | role | status | create_time | role_time |\n==============================================================================================================================\n 1 | tdc01:6030 | follower | ready | 2023-09-04 18:58:10.393 | 2023-09-04 20:50:36.959 |\n 2 | tdc02:6030 | follower | ready | 2023-09-04 20:23:33.318 | 2023-09-04 20:45:43.682 |\n<strong>3<\/strong><strong>|<\/strong><strong> tdc03:<\/strong><strong>6030<\/strong><strong>|<\/strong><strong> leader <\/strong><strong>|<\/strong><strong> ready <\/strong><strong>|<\/strong><strong>2023-09-04<\/strong><strong>20<\/strong><strong>:<\/strong><strong>24<\/strong><strong>:<\/strong><strong>38.435<\/strong><strong>|<\/strong><strong>2023-09-04<\/strong><strong>20<\/strong><strong>:<\/strong><strong>45<\/strong><strong>:<\/strong><strong>43.693<\/strong><strong>|<\/strong>\nQuery OK, 3 row(s) in set (0.004637s)<\/code><\/pre>\n\n\n\nTake a look at the vgroups as well.<\/p>\n\n\n\n
taos> show testha.vgroups\\G;\n*************************** 1.row ***************************\n vgroup_id: 3\n db_name: testha\n tables: 0\n v1_dnode: 1\n v1_status: follower\n v2_dnode: 2\n v2_status: follower\n v3_dnode: 3\n v3_status: leader\n v4_dnode: NULL\n v4_status: NULL\n cacheload: 0\ncacheelements: 0\n tsma: 0\n*************************** 2.row ***************************\n vgroup_id: 4\n db_name: testha\n tables: 1\n v1_dnode: 1\n v1_status: follower\n v2_dnode: 2\n v2_status: leader\n v3_dnode: 3\n v3_status: follower\n v4_dnode: NULL\n v4_status: NULL\n cacheload: 0\ncacheelements: 0\n tsma: 0\nQuery OK, 2 row(s) in set (0.016652s)<\/code><\/pre>\n\n\n\nOnly 1 node is up<\/h3>\n\n\n\n
Now we can address the case when only a single node is running.<\/p>\n\n\n\n
We power down or disconnect nodes tdc01 and tdc02.<\/p>\n\n\n\n
<strong>tdengine@tdc03:~$ <\/strong>ping tdc01\nPING tdc01 (10.0.2.4) 56(84) bytes of data.\n^C\n--- tdc01 ping statistics ---\n3 packets transmitted, 0 received, 100% packet loss, time 2055ms\n\n<strong>tdengine@tdc03:~$<\/strong> ping tdc02\nPING tdc02 (10.0.2.6) 56(84) bytes of data.\nFrom tdc03 (10.0.2.5) icmp_seq=1 Destination Host Unreachable\nFrom tdc03 (10.0.2.5) icmp_seq=2 Destination Host Unreachable\nFrom tdc03 (10.0.2.5) icmp_seq=3 Destination Host Unreachable\nFrom tdc03 (10.0.2.5) icmp_seq=4 Destination Host Unreachable\n^C\n--- tdc02 ping statistics ---\n6 packets transmitted, 0 received, +4 errors, 100% packet loss, time 5066ms\npipe 3<\/code><\/pre>\n\n\n\nNow if we try to connect to the cluster, we cannot. Therefore, it is impossible to query or insert data.<\/p>\n\n\n\n
<strong>tdengine@tdc03:~$<\/strong> taos -h tdc03\nfailed to create dir:\/var\/log\/taos\/ since Operation not permitted WARING: Create taoslog failed:Operation not permitted. configDir=\/etc\/taos\/\nWelcome to the TDengine Command Line Interface, Client Version:3.1.0.0\nCopyright (c) 2022 by TDengine, all rights reserved.\n\nfailed to connect to server, reason: Sync leader is unreachable<\/code><\/pre>\n\n\n\nNow we spin up or connect the node tdc01.<\/p>\n\n\n\n
<strong>tdengine@tdc03:~$ <\/strong>ping tdc01\nPING tdc01 (10.0.2.4) 56(84) bytes of data.\n64 bytes from tdc01 (10.0.2.4): icmp_seq=1 ttl=64 time=0.285 ms\n64 bytes from tdc01 (10.0.2.4): icmp_seq=2 ttl=64 time=1.10 ms\n^C\n--- tdc01 ping statistics ---\n2 packets transmitted, 2 received, 0% packet loss, time 1003ms\nrtt min\/avg\/max\/mdev = 0.285\/0.691\/1.098\/0.406 ms<\/code><\/pre>\n\n\n\nTry to connect to the cluster again.<\/p>\n\n\n\n
taos> select count(*) from test.meters;\n count(*) |\n========================\n 10000 |\ntaos> show databases;\n name |\n=================================\n information_schema |\n performance_schema |\n test |\n testha |\nQuery OK, 4 row(s) in set (0.004463s)\n\ntaos> select count(*) from testha.t1;\n count(*) |\n========================\n 8 |\nQuery OK, 1 row(s) in set (0.012661s)<\/code><\/pre>\n\n\n\nTDengine Cloud – Enterprise-ready<\/h2>\n\n\n\n
With TDengine Cloud<\/a> you get a highly secure, fully managed service with backups, scalability, high-availability <\/strong>and Enterprise-ready features including SSO and replication across public clouds. You can sign up for a Starter TDengine Cloud account at in less than a minute and it does not require a credit card.<\/p>\n\n\n\nTDengine Cloud is the easiest way for anyone to try the technology behind TDengine and experience a high performance next generation data historian.<\/p>\n","protected":false},"excerpt":{"rendered":"
TDengine is built for high availability in terms of the logical design which extends itself very optimally to a physical architecture.<\/p>\n","protected":false},"author":81,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","footnotes":""},"categories":[21],"tags":[],"ppma_author":[167],"class_list":["post-17828","post","type-post","status-publish","format-standard","hentry","category-engineering"],"authors":[{"term_id":167,"user_id":81,"is_guest":0,"slug":"chait","display_name":"Chait Diwadkar","avatar_url":{"url":"https:\/\/tdengine.com\/wp-content\/uploads\/29.03-05-cdiwadkar.jpg","url2x":"https:\/\/tdengine.com\/wp-content\/uploads\/29.03-05-cdiwadkar.jpg"},"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/tdengine.com\/wp-json\/wp\/v2\/posts\/17828","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tdengine.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tdengine.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tdengine.com\/wp-json\/wp\/v2\/users\/81"}],"replies":[{"embeddable":true,"href":"https:\/\/tdengine.com\/wp-json\/wp\/v2\/comments?post=17828"}],"version-history":[{"count":13,"href":"https:\/\/tdengine.com\/wp-json\/wp\/v2\/posts\/17828\/revisions"}],"predecessor-version":[{"id":24697,"href":"https:\/\/tdengine.com\/wp-json\/wp\/v2\/posts\/17828\/revisions\/24697"}],"wp:attachment":[{"href":"https:\/\/tdengine.com\/wp-json\/wp\/v2\/media?parent=17828"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tdengine.com\/wp-json\/wp\/v2\/categories?post=17828"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tdengine.com\/wp-json\/wp\/v2\/tags?post=17828"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/tdengine.com\/wp-json\/wp\/v2\/ppma_author?post=17828"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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