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# 在 pgsql1 里创建数据库、表或更改数据,在 pgsql2 里可以看到
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```
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- 查看状态
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```
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docker exec -u postgres pgsql1 pg_controldata -D /var/lib/pgsql | grep cluster
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# 主库(pgsql1)输出: in production
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docker exec -u postgres pgsql2 pg_controldata -D /var/lib/pgsql | grep cluster
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# 从库(pgsql2)输出: in archive recovery
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```
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- 从库提升为主库
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```
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docker exec -u postgres pgsql2 pg_ctl promote
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```
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