Hi Paul,
The problem with "too many opened files" is fixed after the change.
The server has almost 100 imapd simultaneous connections. It may have 400 as soon as I move all accounts from an old email server.
command: lsof -p `pidof dbmail-imapd`
Results:
dbmail-im 18804 dbmail cwd DIR 254,0 4096 2 /
dbmail-im 18804 dbmail rtd DIR 254,0 4096 2 /
dbmail-im 18804 dbmail txt REG 254,0 455652 2234524 /usr/local/sbin/dbmail-imapd
dbmail-im 18804 dbmail mem REG 254,0 10272 2097807 /usr/lib/x86_64-linux-gnu/gconv/CP1251.so
dbmail-im 18804 dbmail mem REG 254,0 10272 2099827 /usr/lib/x86_64-linux-gnu/gconv/ISO8859-1.so
dbmail-im 18804 dbmail mem REG 254,0 47616 396852 /lib/x86_64-linux-gnu/libnss_files-2.13.so
dbmail-im 18804 dbmail mem REG 254,0 43560 396854 /lib/x86_64-linux-gnu/libnss_nis-2.13.so
dbmail-im 18804 dbmail mem REG 254,0 31584 396850 /lib/x86_64-linux-gnu/libnss_compat-2.13.so
dbmail-im 18804 dbmail mem REG 254,0 112776 2493664 /root/dbmail-3.1.17/src/modules/.libs/libauth_sql.so.0.0.0
dbmail-im 18804 dbmail mem REG 254,0 72808 2101461 /usr/lib/x86_64-linux-gnu/libp11-kit.so.0.0.0
dbmail-im 18804 dbmail mem REG 254,0 68064 2101464 /usr/lib/x86_64-linux-gnu/libtasn1.so.3.1.16
dbmail-im 18804 dbmail mem REG 254,0 516128 393368 /lib/x86_64-linux-gnu/libgcrypt.so.11.7.0
dbmail-im 18804 dbmail mem REG 254,0 785552 2101479 /usr/lib/x86_64-linux-gnu/libgnutls.so.26.22.4
dbmail-im 18804 dbmail mem REG 254,0 109360 2100708 /usr/lib/x86_64-linux-gnu/libsasl2.so.2.0.25
dbmail-im 18804 dbmail mem REG 254,0 59640 2100713 /usr/lib/x86_64-linux-gnu/liblber-2.4.so.2.8.3
dbmail-im 18804 dbmail mem REG 254,0 14320 393717 /lib/x86_64-linux-gnu/libkeyutils.so.1.4
dbmail-im 18804 dbmail mem REG 254,0 35400 2100688 /usr/lib/x86_64-linux-gnu/libkrb5support.so.0.1
dbmail-im 18804 dbmail mem REG 254,0 162632 2100694 /usr/lib/x86_64-linux-gnu/libk5crypto.so.3.1
dbmail-im 18804 dbmail mem REG 254,0 89056 393220 /lib/x86_64-linux-gnu/libgcc_s.so.1
dbmail-im 18804 dbmail mem REG 254,0 991600 2101103 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.17
dbmail-im 18804 dbmail mem REG 254,0 323088 2100714 /usr/lib/x86_64-linux-gnu/libldap_r-2.4.so.2.8.3
dbmail-im 18804 dbmail mem REG 254,0 257288 2100706 /usr/lib/x86_64-linux-gnu/libgssapi_krb5.so.2.2
dbmail-im 18804 dbmail mem REG 254,0 14672 393283 /lib/x86_64-linux-gnu/libcom_err.so.2.1
dbmail-im 18804 dbmail mem REG 254,0 868096 2100704 /usr/lib/x86_64-linux-gnu/libkrb5.so.3.3
dbmail-im 18804 dbmail mem REG 254,0 697120 2101494 /usr/lib/x86_64-linux-gnu/libsqlite3.so.0.8.6
dbmail-im 18804 dbmail mem REG 254,0 3424672 2110180 /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18.0.0
dbmail-im 18804 dbmail mem REG 254,0 182784 2103614 /usr/lib/libpq.so.5.4
dbmail-im 18804 dbmail mem REG 254,0 174152 2110860 /usr/lib/x86_64-linux-gnu/libevent_core-2.0.so.5.1.7
dbmail-im 18804 dbmail mem REG 254,0 248968 393727 /lib/x86_64-linux-gnu/libpcre.so.3.13.1
dbmail-im 18804 dbmail mem REG 254,0 52192 2110174 /usr/lib/x86_64-linux-gnu/libffi.so.5.0.10
dbmail-im 18804 dbmail mem REG 254,0 80712 396857 /lib/x86_64-linux-gnu/libresolv-2.13.so
dbmail-im 18804 dbmail mem REG 254,0 126232 393262 /lib/x86_64-linux-gnu/libselinux.so.1
dbmail-im 18804 dbmail mem REG 254,0 14112 393366 /lib/x86_64-linux-gnu/libgpg-error.so.0.8.0
dbmail-im 18804 dbmail mem REG 254,0 214456 2104090 /usr/lib/libgpgme-pthread.so.11.7.0
dbmail-im 18804 dbmail mem REG 254,0 89056 396849 /lib/x86_64-linux-gnu/libnsl-2.13.so
dbmail-im 18804 dbmail mem REG 254,0 92752 393306 /lib/x86_64-linux-gnu/libz.so.1.2.7
dbmail-im 18804 dbmail mem REG 254,0 14768 396846 /lib/x86_64-linux-gnu/libdl-2.13.so
dbmail-im 18804 dbmail mem REG 254,0 1603600 396843 /lib/x86_64-linux-gnu/libc-2.13.so
dbmail-im 18804 dbmail mem REG 254,0 131107 396839 /lib/x86_64-linux-gnu/libpthread-2.13.so
dbmail-im 18804 dbmail mem REG 254,0 1637705 2368117 /usr/local/lib/dbmail/libdbmail.so.0.0.0
dbmail-im 18804 dbmail mem REG 254,0 114168 2110838 /usr/lib/x86_64-linux-gnu/libzdb.so.9.0.2
dbmail-im 18804 dbmail mem REG 254,0 2048480 2099587 /usr/lib/x86_64-linux-gnu/libcrypto.so.1.0.0
dbmail-im 18804 dbmail mem REG 254,0 392072 2099588 /usr/lib/x86_64-linux-gnu/libssl.so.1.0.0
dbmail-im 18804 dbmail mem REG 254,0 289224 2100674 /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5.1.7
dbmail-im 18804 dbmail mem REG 254,0 10064 2110866 /usr/lib/x86_64-linux-gnu/libevent_pthreads-2.0.so.5.1.7
dbmail-im 18804 dbmail mem REG 254,0 176696 2110886 /usr/lib/libmhash.so.2.0.1
dbmail-im 18804 dbmail mem REG 254,0 530736 396847 /lib/x86_64-linux-gnu/libm-2.13.so
dbmail-im 18804 dbmail mem REG 254,0 1012792 393745 /lib/x86_64-linux-gnu/libglib-2.0.so.0.3200.4
dbmail-im 18804 dbmail mem REG 254,0 326816 2110902 /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.3200.4
dbmail-im 18804 dbmail mem REG 254,0 1381360 2110907 /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.3200.4
dbmail-im 18804 dbmail mem REG 254,0 463040 2111133 /usr/lib/libgmime-2.6.so.0.600.10
dbmail-im 18804 dbmail mem REG 254,0 31744 396858 /lib/x86_64-linux-gnu/librt-2.13.so
dbmail-im 18804 dbmail mem REG 254,0 6120 2110903 /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0.3200.4
dbmail-im 18804 dbmail mem REG 254,0 14600 2110904 /usr/lib/x86_64-linux-gnu/libgmodule-2.0.so.0.3200.4
dbmail-im 18804 dbmail mem REG 254,0 35104 396845 /lib/x86_64-linux-gnu/libcrypt-2.13.so
dbmail-im 18804 dbmail mem REG 254,0 136936 396840 /lib/x86_64-linux-gnu/ld-2.13.so
dbmail-im 18804 dbmail mem REG 254,0 26066 2099894 /usr/lib/x86_64-linux-gnu/gconv/gconv-modules.cache
dbmail-im 18804 dbmail 0w REG 254,0 0 1323158 /var/log/dbmail.log
dbmail-im 18804 dbmail 1w REG 254,0 1354134131 1323316 /var/log/dbmail.err
dbmail-im 18804 dbmail 2r CHR 1,3 0t0 3075 /dev/null
dbmail-im 18804 dbmail 3u IPv4 300169763 0t0 TCP 172.16.0.132:57511->172.16.0.129:postgresql (ESTABLISHED)
dbmail-im 18804 dbmail 4u IPv4 300169765 0t0 TCP 172.16.0.132:57512->172.16.0.129:postgresql (ESTABLISHED)
dbmail-im 18804 dbmail 5u IPv4 300230960 0t0 TCP dbmail01.dbmail.porta80.com.br:imap2->177.65.62.54:59451 (ESTABLISHED)
dbmail-im 18804 dbmail 6u IPv4 300230989 0t0 TCP dbmail01.dbmail.porta80.com.br:imap2->bd6501c6.virtua.com.br:43237 (ESTABLISHED)
dbmail-im 18804 dbmail 7u IPv4 300169771 0t0 TCP 172.16.0.132:57515->172.16.0.129:postgresql (ESTABLISHED)
dbmail-im 18804 dbmail 8u unix 0xffff8801f3c21540 0t0 300169204 socket
dbmail-im 18804 dbmail 9u unix 0xffff8801f3c20500 0t0 300169205 socket
dbmail-im 18804 dbmail 10u 0000 0,9 0 4274 anon_inode
dbmail-im 18804 dbmail 11u IPv4 300169207 0t0 TCP *:imap2 (LISTEN)
dbmail-im 18804 dbmail 12w REG 0,14 6 300169212 /run/dbmail-imapd.pid
dbmail-im 18804 dbmail 13r FIFO 0,8 0t0 300169213 pipe
dbmail-im 18804 dbmail 14w FIFO 0,8 0t0 300169213 pipe
dbmail-im 18804 dbmail 15u IPv4 300229772 0t0 TCP dbmail01.dbmail.porta80.com.br:imap2->187-24-146-39.3g.claro.net.br:49775 (ESTABLISHED)
dbmail-im 18804 dbmail 16u IPv4 300235058 0t0 TCP dbmail01.dbmail.porta80.com.br:imap2->b12063f8.virtua.com.br:45687 (ESTABLISHED)
dbmail-im 18804 dbmail 17u IPv4 300231105 0t0 TCP dbmail01.dbmail.porta80.com.br:imap2->bd21df1c.virtua.com.br:51545 (ESTABLISHED)
dbmail-im 18804 dbmail 18u IPv4 300235893 0t0 TCP dbmail01.dbmail.porta80.com.br:imap2->191.173.175.60:54331 (ESTABLISHED)
dbmail-im 18804 dbmail 19u IPv4 300235093 0t0 TCP dbmail01.dbmail.porta80.com.br:imap2->177-114-183-121.user.vivozap.com.br:50788 (ESTABLISHED)
dbmail-im 18804 dbmail 20u IPv4 300229717 0t0 TCP dbmail01.dbmail.porta80.com.br:imap2->187-24-146-39.3g.claro.net.br:49774 (ESTABLISHED)
dbmail-im 18804 dbmail 21u IPv4 300224279 0t0 TCP 172.16.0.132:60278->172.16.0.129:postgresql (ESTABLISHED)
dbmail-im 18804 dbmail 22u IPv4 300235894 0t0 TCP dbmail01.dbmail.porta80.com.br:imap2->191.173.175.60:54332 (ESTABLISHED)
dbmail-im 18804 dbmail 24u IPv4 300174008 0t0 TCP dbmail01.dbmail.porta80.com.br:imap2->bd6501c6.virtua.com.br:48690 (ESTABLISHED)
dbmail-im 18804 dbmail 26u IPv4 300173336 0t0 TCP dbmail01.dbmail.porta80.com.br:imap2->instant6.my.com:43600 (ESTABLISHED)
dbmail-im 18804 dbmail 30u IPv4 300214842 0t0 TCP 172.16.0.132:59758->172.16.0.129:postgresql (ESTABLISHED)
dbmail-im 18804 dbmail 33u IPv4 300235037 0t0 TCP dbmail01.dbmail.porta80.com.br:imap2->177-114-183-121.user.vivozap.com.br:50786 (ESTABLISHED)
dbmail-im 18804 dbmail 34u sock 0,7 0t0 300195365 can't identify protocol
dbmail-im 18804 dbmail 35u IPv4 300234880 0t0 TCP dbmail01.dbmail.porta80.com.br:imap2->177-114-183-121.user.vivozap.com.br:50770 (ESTABLISHED)
dbmail-im 18804 dbmail 36u IPv4 300234881 0t0 TCP dbmail01.dbmail.porta80.com.br:imap2->177-114-183-121.user.vivozap.com.br:50771 (ESTABLISHED)
dbmail-im 18804 dbmail 37u sock 0,7 0t0 300195371 can't identify protocol
Regards.
Rogerio
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