我似乎被夹在两个操作之间，既pg_upgrade要更改PostgreSQL主要版本，pg_ctl又要控制old cluster.
[Sun Dec 30 09:29 rich@HQ /usr/local/var] /usr/local/Cellar/postgresql@10/10.6/bin/pg_upgrade -v \
> -b /usr/local/Cellar/postgresql@10/10.6/bin \
> -B /usr/local/Cellar/postgresql/11.1/bin \
> -d /usr/local/var/postgres.old \
> -D /usr/local/var/postgres
Running in verbose mode
"/usr/local/Cellar/postgresql@10/10.6/bin/pg_ctl" -w -l "pg_upgrade_server.log" -D "/usr/local/var/postgres.old" -o "-p 50432 -c autovacuum=off -c autovacuum_freeze_max_age=2000000000 -c listen_addresses='' -c unix_socket_permissions=0700" start >> "pg_upgrade_server.log" 2>&1
There seems to be a postmaster servicing the old cluster.
Please shutdown that postmaster and try again.
Failure, exiting
我试图重命名/usr/local/var/postgres/postgresql.pid，但这并没有解决任何问题。文档说我可以pg_ctl用来关闭邮局主管，但这不起作用：
[Sun Dec 30 09:44 rich@HQ ~] pg_ctl --pgdata=/usr/local/var/postgres start -m fast
pg_ctl: another server might be running; trying to start server anyway
waiting for server to start....2018-12-30 09:44:33.541 EST [12042] FATAL: database files are incompatible with server
2018-12-30 09:44:33.541 EST [12042] DETAIL: The data directory was initialized by PostgreSQL version 10, which is not compatible with this version 11.1.
stopped waiting
pg_ctl: could not start server
Examine the log output.
所以不关闭postmaster就无法升级版本，而关闭postmaster需要初始化新版本。我被抓住了。任何关于我如何开始11.1工作的见解都值得赞赏。
更新
尝试处理旧版本后更新日志显示如下：
-----------------------------------------------------------------
pg_upgrade run on Tue Jan 1 21:22:45 2019
-----------------------------------------------------------------
command: "/usr/local/Cellar/postgresql@10/10.6/bin/pg_ctl" -w -l "pg_upgrade_server.log" -D "/usr/local/var/postgres.old" -o "-p 50432 -c autovacuum=off -c autovacuum_freeze_max_age=2000000000 -c listen_addresses='' -c unix_socket_permissions=0700" start >> "pg_upgrade_server.log" 2>&1
pg_ctl: another server might be running; trying to start server anyway
dyld: Library not loaded: /usr/local/opt/icu4c/lib/libicui18n.62.dylib
Referenced from: /usr/local/Cellar/postgresql@10/10.6/bin/postgres
Reason: image not found
no data was returned by command ""/usr/local/Cellar/postgresql@10/10.6/bin/postgres" -V"
The program "postgres" is needed by pg_ctl but was not found in the
same directory as "/usr/local/Cellar/postgresql@10/10.6/bin/pg_ctl".
Check your installation.
[Tue Jan 01 21:23 rich@HQ /usr/local/Cellar/postgresql@10/10.6/bin] ll
total 18960
drwxr-xr-x 38 rich admin 1.3K Dec 28 17:01 .
drwxr-xr-x 14 rich admin 476B Dec 28 16:56 ..
-r-xr-xr-x 1 rich admin 51K Nov 16 04:56 clusterdb
-r-xr-xr-x 1 rich admin 55K Nov 16 04:56 createdb
-r-xr-xr-x 1 rich admin 59K Nov 16 04:56 createuser
-r-xr-xr-x 1 rich admin 51K Nov 16 04:56 dropdb
-r-xr-xr-x 1 rich admin 51K Nov 16 04:56 dropuser
-r-xr-xr-x 1 rich admin 789K Nov 16 04:56 ecpg
-r-xr-xr-x 1 rich admin 113K Nov 16 04:56 initdb
-r-xr-xr-x 1 rich admin 30K Nov 16 04:56 oid2name
-r-xr-xr-x 1 rich admin 26K Nov 16 04:56 pg_archivecleanup
-r-xr-xr-x 1 rich admin 102K Nov 16 04:56 pg_basebackup
-r-xr-xr-x 1 rich admin 30K Nov 16 04:56 pg_config
-r-xr-xr-x 1 rich admin 38K Nov 16 04:56 pg_controldata
-r-xr-xr-x 1 rich admin 52K Nov 16 04:56 pg_ctl
-r-xr-xr-x 1 rich admin 351K Nov 16 04:56 pg_dump
-r-xr-xr-x 1 rich admin 92K Nov 16 04:56 pg_dumpall
-r-xr-xr-x 1 rich admin 51K Nov 16 04:56 pg_isready
-r-xr-xr-x 1 rich admin 65K Nov 16 04:56 pg_receivewal
-r-xr-xr-x 1 rich admin 70K Nov 16 04:56 pg_recvlogical
-r-xr-xr-x 1 rich admin 47K Nov 16 04:56 pg_resetwal
-r-xr-xr-x 1 rich admin 148K Nov 16 04:56 pg_restore
-r-xr-xr-x 1 rich admin 78K Nov 16 04:56 pg_rewind
-r-xr-xr-x 1 rich admin 26K Nov 16 04:56 pg_standby
-r-xr-xr-x 1 rich admin 31K Nov 16 04:56 pg_test_fsync
-r-xr-xr-x 1 rich admin 26K Nov 16 04:56 pg_test_timing
-r-xr-xr-x 1 rich admin 120K Nov 16 04:56 pg_upgrade
-rw------- 1 rich admin 796B Dec 28 17:04 pg_upgrade_internal.log
-rw------- 1 rich admin 358B Dec 28 17:04 pg_upgrade_server.log
-rw------- 1 rich admin 358B Dec 28 17:04 pg_upgrade_utility.log
-r-xr-xr-x 1 rich admin 76K Nov 16 04:56 pg_waldump
-r-xr-xr-x 1 rich admin 122K Nov 16 04:56 pgbench
-r-xr-xr-x 1 rich admin 5.8M Nov 16 04:55 postgres
lrwxr-xr-x 1 rich admin 8B Nov 16 04:55 postmaster -> postgres
-r-xr-xr-x 1 rich admin 544K Nov 16 04:56 psql
-r-xr-xr-x 1 rich admin 59K Nov 16 04:56 reindexdb
-r-xr-xr-x 1 rich admin 64K Nov 16 04:56 vacuumdb
-r-xr-xr-x 1 rich admin 30K Nov 16 04:56 vacuumlo