引言

在服务器管理中，监控和分析CPU使用情况是至关重要的。CentOS作为一款广泛使用的Linux发行版，其日志系统为我们提供了丰富的信息。本文将带你深入了解CentOS系统CPU使用日志分析的全过程，包括脚本编写和性能优化技巧，帮助你轻松掌握这一技能。

一、了解CPU使用日志

1.1 日志文件

CentOS系统中，CPU使用情况通常记录在/var/log/messages或/var/log/syslog等日志文件中。此外，/var/log/vmstat文件也包含了CPU的使用信息。

1.2 日志格式

日志文件通常采用标准的Unix日志格式，例如：

Jun  5 15:34:45 server01 kernel: [  828.672516] cpu 0: 3.3% us, 0.0% sy, 0.0% ni, 96.7% id, 0.0% wa, 0.0% hi, 0.0% si

这里表示CPU 0在15:34:45这一时刻的使用情况：用户空间占用3.3%，系统空间占用0.0%，其他占用0.0%，空闲占用96.7%，等待占用0.0%，硬中断占用0.0%，软中断占用0.0%。

二、编写脚本分析CPU使用日志

2.1 脚本基础

使用Bash脚本可以方便地分析CPU使用日志。以下是一个简单的脚本示例：

”`bash #!/bin/bash

获取日志文件路径

LOG_FILE=“/var/log/messages”

获取指定时间范围内的CPU使用情况

awk ‘/cpu/ {print \(0}' \)LOG_FILE |
awk ‘{print \(1, \)2, \(3, \)4, \(5, \)6, \(7, \)8, \(9, \)10, \(11, \)12, \(13, \)14, \(15, \)16, \(17, \)18, \(19, \)20, \(21, \)22, \(23, \)24, \(25, \)26, \(27, \)28, \(29, \)30, \(31, \)32, \(33, \)34, \(35, \)36, \(37, \)38, \(39, \)40, \(41, \)42, \(43, \)44, \(45, \)46, \(47, \)48, \(49, \)50, \(51, \)52, \(53, \)54, \(55, \)56, \(57, \)58, \(59, \)60, \(61, \)62, \(63, \)64, \(65, \)66, \(67, \)68, \(69, \)70, \(71, \)72, \(73, \)74, \(75, \)76, \(77, \)78, \(79, \)80, \(81, \)82, \(83, \)84, \(85, \)86, \(87, \)88, \(89, \)90, \(91, \)92, \(93, \)94, \(95, \)96, \(97, \)98, \(99, \)100, \(101, \)102, \(103, \)104, \(105, \)106, \(107, \)108, \(109, \)110, \(111, \)112, \(113, \)114, \(115, \)116, \(117, \)118, \(119, \)120, \(121, \)122, \(123, \)124, \(125, \)126, \(127, \)128, \(129, \)130, \(131, \)132, \(133, \)134, \(135, \)136, \(137, \)138, \(139, \)140, \(141, \)142, \(143, \)144, \(145, \)146, \(147, \)148, \(149, \)150, \(151, \)152, \(153, \)154, \(155, \)156, \(157, \)158, \(159, \)160, \(161, \)162, \(163, \)164, \(165, \)166, \(167, \)168, \(169, \)170, \(171, \)172, \(173, \)174, \(175, \)176, \(177, \)178, \(179, \)180, \(181, \)182, \(183, \)184, \(185, \)186, \(187, \)188, \(189, \)190, \(191, \)192, \(193, \)194, \(195, \)196, \(197, \)198, \(199, \)200, \(201, \)202, \(203, \)204, \(205, \)206, \(207, \)208, \(209, \)210, \(211, \)212, \(213, \)214, \(215, \)216, \(217, \)218, \(219, \)220, \(221, \)222, \(223, \)224, \(225, \)226, \(227, \)228, \(229, \)230, \(231, \)232, \(233, \)234, \(235, \)236, \(237, \)238, \(239, \)240, \(241, \)242, \(243, \)244, \(245, \)246, \(247, \)248, \(249, \)250, \(251, \)252, \(253, \)254, \(255, \)256, \(257, \)258, \(259, \)260, \(261, \)262, \(263, \)264, \(265, \)266, \(267, \)268, \(269, \)270, \(271, \)272, \(273, \)274, \(275, \)276, \(277, \)278, \(279, \)280, \(281, \)282, \(283, \)284, \(285, \)286, \(287, \)288, \(289, \)290, \(291, \)292, \(293, \)294, \(295, \)296, \(297, \)298, \(299, \)300, \(301, \)302, \(303, \)304, \(305, \)306, \(307, \)308, \(309, \)310, \(311, \)312, \(313, \)314, \(315, \)316, \(317, \)318, \(319, \)320, \(321, \)322, \(323, \)324, \(325, \)326, \(327, \)328, \(329, \)330, \(331, \)332, \(333, \)334, \(335, \)336, \(337, \)338, \(339, \)340, \(341, \)342, \(343, \)344, \(345, \)346, \(347, \)348, \(349, \)350, \(351, \)352, \(353, \)354, \(355, \)356, \(357, \)358, \(359, \)360, \(361, \)362, \(363, \)364, \(365, \)366, \(367, \)368, \(369, \)370, \(371, \)372, \(373, \)374, \(375, \)376, \(377, \)378, \(379, \)380, \(381, \)382, \(383, \)384, \(385, \)386, \(387, \)388, \(389, \)390, \(391, \)392, \(393, \)394, \(395, \)396, \(397, \)398, \(399, \)400, \(401, \)402, \(403, \)404, \(405, \)406, \(407, \)408, \(409, \)410, \(411, \)412, \(413, \)414, \(415, \)416, \(417, \)418, \(419, \)420, \(421, \)422, \(423, \)424, \(425, \)426, \(427, \)428, \(429, \)430, \(431, \)432, \(433, \)434, \(435, \)436, \(437, \)438, \(439, \)440, \(441, \)442, \(443, \)444, \(445, \)446, \(447, \)448, \(449, \)450, \(451, \)452, \(453, \)454, \(455, \)456, \(457, \)458, \(459, \)460, \(461, \)462, \(463, \)464, \(465, \)466, \(467, \)468, \(469, \)470, \(471, \)472, \(473, \)474, \(475, \)476, \(477, \)478, \(479, \)480, \(481, \)482, \(483, \)484, \(485, \)486, \(487, \)488, \(489, \)490, \(491, \)492, \(493, \)494, \(495, \)496, \(497, \)498, \(499, \)500, \(501, \)502, \(503, \)504, \(505, \)506, \(507, \)508, \(509, \)510, \(511, \)512, \(513, \)514, \(515, \)516, \(517, \)518, \(519, \)520, \(521, \)522, \(523, \)524, \(525, \)526, \(527, \)528, \(529, \)530, \(531, \)532, \(533, \)534, \(535, \)536, \(537, \)538, \(539, \)540, \(541, \)542, \(543, \)544, \(545, \)546, \(547, \)548, \(549, \)550, \(551, \)552, \(553, \)554, \(555, \)556, \(557, \)558, \(559, \)560, \(561, \)562, \(563, \)564, \(565, \)566, \(567, \)568, \(569, \)570, \(571, \)572, \(573, \)574, \(575, \)576, \(577, \)578, \(579, \)580, \(581, \)582, \(583, \)584, \(585, \)586, \(587, \)588, \(589, \)590, \(591, \)592, \(593, \)594, \(595, \)596, \(597, \)598, \(599, \)600, \(601, \)602, \(603, \)604, \(605, \)606, \(607, \)608, \(609, \)610, \(611, \)612, \(613, \)614, \(615, \)616, \(617, \)618, \(619, \)620, \(621, \)622, \(623, \)624, \(625, \)626, \(627, \)628, \(629, \)630, \(631, \)632, \(633, \)634, \(635, \)636, \(637, \)638, \(639, \)640, \(641, \)642, \(643, \)644, \(645, \)646, \(647, \)648, \(649, \)650, \(651, \)652, \(653, \)654, \(655, \)656, \(657, \)658, \(659, \)660, \(661, \)662, \(663, \)664, \(665, \)666, \(667, \)668, \(669, \)670, \(671, \)672, \(673, \)674, \(675, \)676, \(677, \)678, \(679, \)680, \(681, \)682, \(683, \)684, \(685, \)686, \(687, \)688, \(689, \)690, \(691, \)692, \(693, \)694, \(695, \)696, \(697, \)698, \(699, \)700, \(701, \)702, \(703, \)704, \(705, \)706, \(707, \)708, \(709, \)710, \(711, \)712, \(713, \)714, \(715, \)716, \(717, \)718, \(719, \)720, \(721, \)722, \(723, \)724, \(725, \)726, \(727, \)728, \(729, \)730, \(731, \)732, \(733, \)734, \(735, \)736, \(737, \)738, \(739, \)740, \(741, \)742, \(743, \)744, \(745, \)746, \(747, \)748, \(749, \)750, \(751, \)752, \(753, \)754, \(755, \)756, \(757, \)758, \(759, \)760, \(761, \)762, \(763, \)764, \(765, \)766, \(767, \)768, \(769, \)770, \(771, \)772, \(773, \)774, \(775, \)776, \(777, \)778, \(779, \)780, \(781, \)782, \(783, \)784, \(785, \)786, \(787, \)788, \(789, \)790, \(791, \)792, \(793, \)794, \(795, \)796, \(797, \)798, \(799, \)800, \(801, \)802, \(803, \)804, \(805, \)806, \(807, \)808, \(809, \)810, \(811, \)812, \(813, \)814, \(815, \)816, \(817, \)818, \(819, \)820, \(821, \)822, \(823, \)824, \(825, \)826, \(827, \)828, \(829, \)830, \(831, \)832, \(833, \)834, \(835, \)836, \(837, \)838, \(839, \)840, \(841, \)842, \(843, \)844, \(845, \)846, \(847, \)848, \(849, \)850, \(851, \)852, \(853, \)854, \(855, \)856, \(857, \)858, \(859, \)860, \(861, \)862, \(863, \)864, \(865, \)866, \(867, \)868, \(869, \)870, \(871, \)872, \(873, \)874, \(875, \)876, \(877, \)878, \(879, \)880, \(881, \)882, \(883, \)884, \(885, \)886, \(887, \)888, \(889, \)890, \(891, \)892, \(893, \)894, \(895, \)896, \(897, \)898, \(899, \)900, \(901, \)902, \(903, \)904, \(905, \)906, \(907, \)908, \(909, \)910, \(911, \)912, \(913, \)914, \(915, \)916, \(917, \)918, \(919, \)920, \(921, \)922, \(923, \)924, \(925, \)926, \(927, \)928, \(929, \)930, \(931, \)932, \(933, \)934, \(935, \)936, \(937, \)938, \(939, \)940, \(941, \)942, \(943, \)944, \(945, \)946, \(947, \)948, \(949, \)950, \(951, \)952, \(953, \)954, \(955, \)956, \(957, \)958, \(959, \)960, \(961, \)962, \(963, \)964, \(965, \)966, \(967, \)968, \(969, \)970, \(971, \)972, \(973, \)974, \(975, \)976, \(977, \)978, \(979, \)980, \(981, \)982, \(983, \)984, \(985, \)986, \(987, \)988, \(989, \)990, \(991, \)992,