2025年3月30日，官方發布了Keepalived的最新版，版本號：2.3.3

而2024年11月3日發布的2.3.2版本，在CentOS 7.9上編譯的時候，就出現了報錯，但是在Alma Linux 8.10上，則可以成功編譯安裝，當時我就覺得可能從2.3.2版本開始，Keepalived已經不再支持CentOS 7了，但是在這個版本的發布聲明中，官方并沒有明確提及這個問題。

下載地址：https://keepalived.org/software/keepalived-2.3.3.tar.gz （不再兼容CentOS/Redhat 7.x版本）

相關報錯記錄詳見：https://blog.csdn.net/cnskylee/article/details/143572514

但是，這次的2.3.3版的發布聲明文檔中，官方已經明確申明，Keepalived 2.3.3版本不再支持CentOS 7系統。

但是，這里讓我很不解的是，官方又在 Improvements 說明，允許在非常老的系統中編譯（內核版本 < 3.15），不過我在CentOS 7.9系統中編譯，還是出現錯誤，信息如下：

[root@node02 keepalived-2.3.3]# make
Making all in lib
make[1]: 進入目錄“/usr/local/src/keepalived-2.3.3/lib”
make  all-am
make[2]: 進入目錄“/usr/local/src/keepalived-2.3.3/lib”CC       memory.oCC       utils.o
utils.c: 在函數‘dump_buffer’中:
utils.c:106:5: 警告：無法優化可能無窮的循環 [-Wunsafe-loop-optimizations]for (j = i - 15; j <= i; j++)^CC       notify.oCC       timer.oCC       scheduler.oCC       vector.oCC       html.oCC       parser.oCC       signals.oCC       logger.oCC       list_head.oCC       rbtree.oCC       process.oCC       json_writer.oCC       rttables.oAR       liblib.a
make[2]: 離開目錄“/usr/local/src/keepalived-2.3.3/lib”
make[1]: 離開目錄“/usr/local/src/keepalived-2.3.3/lib”
Making all in keepalived
make[1]: 進入目錄“/usr/local/src/keepalived-2.3.3/keepalived”
Making all in core
make[2]: 進入目錄“/usr/local/src/keepalived-2.3.3/keepalived/core”CC       main.o
main.c: 在函數‘sigend’中:
main.c:1210:34: 警告：assuming signed overflow does not occur when simplifying conditional to constant [-Wstrict-overflow]for (i = 0; i < NUM_CHILD_TERM && wait_count; i++) {^
main.c:1232:6: 警告：assuming signed overflow does not occur when simplifying conditional to constant [-Wstrict-overflow]if (wait_count) {^
main.c:1169:8: 警告：assuming signed overflow does not occur when simplifying conditional to constant [-Wstrict-overflow]while (wait_count) {^CC       daemon.oCC       pidfile.oCC       layer4.oCC       smtp.oCC       global_data.oCC       global_parser.oCC       keepalived_netlink.o
keepalived_netlink.c: 在函數‘rta_addattr_l’中:
keepalived_netlink.c:748:42: 警告：在有符號和無符號整數表達式間比較 [-Wsign-compare]if (RTA_ALIGN(rta->rta_len) + align_len > maxlen)^
keepalived_netlink.c: 在函數‘rta_addattr_l2’中:
keepalived_netlink.c:769:42: 警告：在有符號和無符號整數表達式間比較 [-Wsign-compare]if (RTA_ALIGN(rta->rta_len) + align_len > maxlen)^CC       namespaces.oCC       track_process.oCC       reload_monitor.oCC       config_notify.oAR       libcore.a
make[2]: 離開目錄“/usr/local/src/keepalived-2.3.3/keepalived/core”
Making all in vrrp
make[2]: 進入目錄“/usr/local/src/keepalived-2.3.3/keepalived/vrrp”CC       vrrp_daemon.oCC       vrrp_print.oCC       vrrp_data.oCC       vrrp_parser.oCC       vrrp.o
vrrp.c: 在函數‘vrrp_check_packet’中:
vrrp.c:1053:23: 警告：在有符號和無符號整數表達式間比較 [-Wsign-compare]vrrp->adver_int != (V3_PKT_ADVER_INT_NTOH(hd->v3.adver_int)) * TIMER_CENTI_HZ) {^
vrrp.c: 在函數‘open_vrrp_read_socket’中:
vrrp.c:2717:103: 錯誤：‘IPV6_FREEBIND’未聲明(在此函數內第一次使用)if (setsockopt(fd, family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6, family == AF_INET ? IP_FREEBIND : IPV6_FREEBIND, &on, sizeof on))^
vrrp.c:2717:103: 附注：每個未聲明的標識符在其出現的函數內只報告一次
make[2]: *** [vrrp.o] 錯誤 1
make[2]: 離開目錄“/usr/local/src/keepalived-2.3.3/keepalived/vrrp”
make[1]: *** [all-recursive] 錯誤 1
make[1]: 離開目錄“/usr/local/src/keepalived-2.3.3/keepalived”
make: *** [all-recursive] 錯誤 1
[root@node02 keepalived-2.3.3]# uname -a
Linux node02 3.10.0-1160.119.1.el7.x86_64 #1 SMP Tue Jun 4 14:43:51 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

而這個問題，估計就與3.15版本的內核中新引入的“開放式文件描述符鎖-Open file descriptor locks”有關系。