Linux下Tomcat启动报错:port already in use,导致该问题的原因很多,标题说明不了具体问题。 在此仅说下我的操作,遇到的问题及其解决方法,希望能起到抛砖引玉的作用。...启动tomcat,报错如下: Error: Exception thrown by the agent : Java.rmi.server.ExportException: Port already in...Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.port
2.使用netstat 使用netstat -anp|grep 80
socket(int domain, int type, int protocol); domain :指定通信协议族(protocol family/address) /usr/include/i386-linux-gnu...下面来看看FreeBSD的源码,linux 的实现差不多,有个小区别等会指出。...2、Tcp syn port scan TCP 三次握手就不说了,端口扫描过程如下: 1. Send a Syn packet to a port A 2....Syn+Ack reply means the port is open , Rst packet means port is closed , and otherwise it might be inaccessible...Error message : %s \n" , errno , strerror(errno)); exit(0); } for(port = 1 ; port port++)
在Linux上,有一个sysctl参数ip_local_port_range,可用于定义网络连接可用作其源(本地)端口的最小和最大端口的限制,同时适用于TCP和UDP连接。...查看当前系统开放端口范围,命令如下: # cat /proc/sys/net/ipv4/ip_local_port_range 32768 61000 要么: # sysctl net.ipv4.ip_local_port_rangenet.ipv4...# sysctl -w net.ipv4.ip_local_port_range="15000 64000"net.ipv4.ip_local_port_range = 15000 64000 或者直接通过使用...echo "15000 64000" > /proc/sys/net/ipv4/ip_local_port_range 如果想要持久生效,并且重启不会失效,请将配置保存在/etc/sysctl.conf...# cat /etc/sysctl.d/net.ipv4.ip_local_port_range.confnet.ipv4.ip_local_port_range = 15000 65000 要了解服务器当前处理的会话数
一、端口的定义端口(Port)是计算机网络中的一个逻辑概念,用于标识计算机上运行的不同网络应用程序或服务。它是一个16位的数字编号,范围是0 - 65535。
命令就呼之欲出了,scan命令可以达到keys命令的效果同时又不会redis出现类似stop-the-world事件的发生, SCAN 命令是一个基于游标的迭代器(cursor based iterator...): SCAN 命令每次被调用之后, 都会向用户返回一个新的游标, 用户在下次迭代时需要使用这个新游标作为 SCAN 命令的游标参数, 以此来延续之前的迭代过程。...scan命令格式: SCAN cursor [MATCH pattern] [COUNT count] 如果省略count参数的话,默认只返回一部分数据,为了返回全部key,可以将count设置的大些...) "hello" 127.0.0.1:7006> OK,到此结束,与scan类似的命令还有: SCAN 命令用于迭代当前数据库中的数据库键。...redisdoc.com/database/scan.html#scan
------Impaladbeeswax_port21000Port on which Beeswax client requests are served by Impala Daemon 被 impala-shell...参见 Configuring Impala to Work with ODBC 了解详细信息hs2_port21050Port on which HiveServer2 client requests...Port--state_store_subscriber_port23000InternalInternal use only....Service Port--state_store_subscriber_port23020InternalInternal use only....Service Port--catalog_service_port26000InternalInternal use only.
INDEX FULL SCAN 与 INDEX FAST FULL SCAN两个长相差不多,乃是一母同胞,因此既有其共性,也有其个性。...会在index fast full scan 像full table scan一样生效,因为整个索引都被访问,Oracle 此时允许出现多块读(multiblock_read)。...一旦上述几个条件满足,基于成本的优化器根据表和索引的统计信息来调用 index full scan 或者index fast full scan。...与INDEX FAST FULL SCAN所不同的是,INDEX FULL SCAN会完全按照索引存储的顺序依次访问整个索引树。...,'SYSTEM'); 五、位图索引时的INDEX FULL SCAN 与 INDEX FAST FULL SCAN 在使用位图索引时,index full SCAN 与 index fast
#include #include #include //#define HAVE_DEBUG_SCAN_OTHERS_TYPE...((x)[0])) static int get_elf_num_version(void); static char *get_elf_str_version(void); static int scan_udisk...(void); #ifdef HAVE_DEBUG_SCAN_OTHERS_TYPE static void get_others_type(struct udev_device *device); #...= udev_enumerate_scan_devices(enumerate)) { printf("[%s +%d %s] failed to udev_enumerate_scan_devices...\n", __FILE__, __LINE__, __func__); ret = -1; goto err_udev_enumerate_scan_devices;
背景: 前端在查kylin时,scan timeout CDH5.10 kylin1.6 错误如下: 2017-07-20 17:03:18,360 INFO org.apache.kylin.storage.hbase.cube.v2....coprocessor.endpoint.CubeVisitService: The cube visit did not finish normally because scan num exceeds...threshold org.apache.kylin.gridtable.GTScanExceedThresholdException: Exceed scan threshold at 393073...coprocessor.endpoint.generated.CubeVisitProtosCubeVisitService.callMethod( 原因3点: 说白了就是kylin关于hbase的3个参数: kylin.query.scan.threshold...kylin.query.coprocessor.mem.gb 任何一个参数不达标都会报regionserver 都会报org.apache.kylin.gridtable.GTScanExceedThresholdException: Exceed scan
PHP_HOST_PORT=9000 PHP_HYPERF1_PORT=9501 PHP_HYPERF2_PORT=9502 PHP_HYPERF3_PORT=9503 // docker-compose.yml...- "${PHP_HOST_PORT}:9000" - "${PHP_HYPERF1_PORT}:9501" - "${PHP_HYPERF2_PORT}:9502"...- "${PHP_HYPERF3_PORT}:9503" extra_hosts: - "www.site1.com:172.17.0.1" volumes: -
前面给大家介绍了Redis的使用,今天将为大家介绍一下我们的JedisPool,那么Jedis是什么和为什么要使用它呢?
http://www.iana.org/assignments/port-numbers PORT NUMBERS (last updated 2009-10-28) The port numbers...Dickey 27 September 2007 xnds 2157/tcp Xerox Network Document Scan...Protocol xnds 2157/udp Xerox Network Document Scan Protocol #...REQUESTER 2 pn-requester2 2718/udp PN REQUESTER 2 # Portnoy Boxman scan-change...2719/tcp Scan & Change scan-change 2719/udp Scan & Change # Alexander Raji <araji&lucent.com
TCP端口53 (TCP Port 53) One of the used DNS port is TCP Port 53....UDP端口53 (UDP Port 53) The most known and popular usage protocol of DNS is UDP 53....Most DNS servers use UDP 53 port which provides simplicity and less resource usage....So DNSSEC uses TCP 53 port for communication. DNSSEC提供安全的DNS事务,该事务将确保域名到IP转换的安全方式。...Understanding DNS Port 53 with Examples What is DNS? DNS Meaning Exploring EDNS with Examples
tf.scan(fn, elems, initializer=None, parallel_iterations=10, back_prop=True, swap_memory=False, infer_shape...z = 10 x = tf.convert_to_tensor(x) z = tf.convert_to_tensor(z) def f(x,y): return x+y g = tf.scan
建议生产环境屏蔽keys命令 Redis 为了解决这个问题,它在 2.8 版本中加入了指令——scan。...,这点非常重要; 遍历的过程中如果有数据修改,改动后的数据能不能遍历到是不确定的; 单次返回的结果是空的并不意味着遍历结束,而要看返回的游标值是否为零 scan 基础使用 SCAN cursor [MATCH...pattern] [COUNT count] 初始执行scan命令例如scan 0。...$redis-cli scan 0 match key99* count 10 1) "15360" 2) (empty list or set) $redis-cli scan 15360 match...key99* count 10 1) "2304" 2) (empty list or set) 更多的 scan 指令 scan 指令是一系列指令,除了可以遍历所有的 key 之外,还可以对指定的容器集合进行遍历
How the MediaScannerRecieve handles the intent It will scan internal storage only after receiving the...It will scan the single file when receiving the Intent.ACTION_MEDIA_SCANNER_SCAN_FILE intent....Mutiple Files Sending Mutiple Intent.ACTION_MEDIA_SCANNER_SCAN_FILE broadcast intents....Why Sending MEDIA_SCANNER_SCAN_FILE broadcast not works Actually someone may think sending ACTION_MEDIA_SCANNER_SCAN_FILE...} else if (action.equals(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE) && path !
序 本文主要研究一下flink taskmanager的data.port与rpc.port Deploying+Tasks+Happens+during+initial+deployment+and...} final String portRangeDefinition = configuration.getString(TaskManagerOptions.RPC_PORT...configuration); } //...... } TaskManagerRunner提供了createRpcService方法,其从配置文件读取taskmanager.rpc.port...则取的是server.getLocalAddress().getPort() TaskManagerRunner提供了createRpcService方法,其从配置文件读取taskmanager.rpc.port...,然后调用AkkaRpcServiceUtils.createRpcService来创建RpcService doc taskmanager-data-port taskmanager-rpc-port
set 2(有 set 1、set 2 以及 set 3) 基本 scan code:绝大多数 scan code 是 1 byte 的。...扩展 scan code:由 e0、e1 或 e2 引导 特殊的 PrintScreen/SysRq 键:e0 2a e0 37 物殊的 Pause/Break 键:e1 1d 45 e1 9d c5...2、小键盘 scan code 表 key mark(Hex) break(Hex) 描述 NumLock 45 c5 break = mark + 0x80 / e0 35 e0 b5 由 e0 引导出...3、附加键 scan code 表 key mark(Hex) break(Hex) 描述 PrintScreen/SysRq e0 2a e0 37 e0 b7 e0 aa extend scan code...4、功能键 scan code 表 key mark(Hex) break(Hex) 描述 01 81 scan code F1 3b bb 同上 F2 3c bc 同上 F3 3d bd
Port: TCP:1521 [root@raclhr-11gR2-N1 ~]# 1.1.1.2 修改rac所有节点的/etc/hosts信息 [root@raclhr-11gR2-N1 ~]#...------------------- Alias LISTENER_SCAN3 Version TNSLSNR for Linux...=192.168.59.176)(PORT=1521))) Services Summary......------------------- Alias LISTENER_SCAN2 Version TNSLSNR for Linux...=192.168.59.175)(PORT=1521))) Services Summary...